diff --git a/_config.yml b/_config.yml
index 84b497860..0c69df5f2 100644
--- a/_config.yml
+++ b/_config.yml
@@ -3,6 +3,10 @@ whitelist:
- jekyll-redirect-from
- jekyll-github-metadata
+plugins:
+ - jekyll-redirect-from
+ - jekyll-github-metadata
+
# files
exclude:
- Makefile
diff --git a/_layouts/redirect.html b/_layouts/redirect.html
new file mode 100644
index 000000000..145bc6d73
--- /dev/null
+++ b/_layouts/redirect.html
@@ -0,0 +1,10 @@
+
+
+
+ Redirecting…
+
+
+ Redirecting...
+ Click here if you are not redirected.
+
+
diff --git a/bash.md b/bash.md
index c6de4d2ba..c2336c771 100644
--- a/bash.md
+++ b/bash.md
@@ -1,5 +1,578 @@
---
title: Bash scripting
category: CLI
-redirect_to: /sh
+layout: 2017/sheet
+tags: [Featured]
+redirect_from:
+ - /sh
+ - /sh.html
---
+
+Getting started
+---------------
+{: .-three-column}
+
+### Example
+
+```bash
+#!/usr/bin/env bash
+
+NAME="John"
+echo "Hello $NAME!"
+```
+
+### Variables
+
+```bash
+NAME="John"
+echo $NAME
+echo "$NAME"
+echo "${NAME}!"
+```
+
+### String quotes
+
+```bash
+NAME="John"
+echo "Hi $NAME" #=> Hi John
+echo 'Hi $NAME' #=> Hi $NAME
+```
+
+### Shell execution
+
+```bash
+echo "I'm in $(pwd)"
+echo "I'm in `pwd`"
+# Same
+```
+
+See [Command substitution](http://wiki.bash-hackers.org/syntax/expansion/cmdsubst)
+
+### Conditional execution
+
+```bash
+git commit && git push
+git commit || echo "Commit failed"
+```
+
+### Functions
+{: id='functions-example'}
+
+```bash
+get_name() {
+ echo "John"
+}
+
+echo "You are $(get_name)"
+```
+
+See: [Functions](#functions)
+
+### Conditionals
+{: id='conditionals-example'}
+
+```bash
+if [ -z "$string" ]; then
+ echo "String is empty"
+elsif [ -n "$string" ]; then
+ echo "String is not empty"
+fi
+```
+
+See: [Conditionals](#conditionals)
+
+### Strict mode
+
+```bash
+set -euo pipefail
+IFS=$'\n\t'
+```
+
+See: [Unofficial bash strict mode](http://redsymbol.net/articles/unofficial-bash-strict-mode/)
+
+### Brace expansion
+
+```bash
+echo {A,B}.js
+```
+
+| `{A,B}` | Same as `A B` |
+| `{A,B}.js` | Same as `A.js B.js` |
+| `{1..5}` | Same as `1 2 3 4 5` |
+
+See: [Brace expansion](http://wiki.bash-hackers.org/syntax/expansion/brace)
+
+
+Parameter expansions
+--------------------
+{: .-three-column}
+
+### Basics
+
+```bash
+name="John"
+echo ${name}
+echo ${name/J/j} #=> "john" (substitution)
+echo ${name:0:2} #=> "jo" (slicing)
+echo ${food:-Cake} #=> $food or "Cake"
+```
+
+```bash
+length=2
+echo ${name:0:length} #=> "jo"
+```
+
+See: [Parameter expansion](http://wiki.bash-hackers.org/syntax/pe)
+
+```bash
+STR="/path/to/foo.cpp"
+echo ${STR%.cpp} # /path/to/foo
+echo ${STR%.cpp}.o # /path/to/foo.o
+
+echo ${STR##*.} # cpp (extension)
+echo ${STR##*/} # foo.cpp (basepath)
+
+echo ${STR#*/} # path/to/foo.cpp
+echo ${STR##*/} # foo.cpp
+
+echo ${STR/foo/bar} # /path/to/bar.cpp
+```
+
+```bash
+STR="Hello world"
+echo ${STR:6:5} # "world"
+echo ${STR:-5:5} # "world"
+```
+
+```bash
+SRC="/path/to/foo.cpp"
+BASE=${STR##*/} #=> "foo.cpp" (basepath)
+DIR=${SRC%$BASE} #=> "/path/to" (dirpath)
+```
+
+### Substitution
+
+| Code | Description |
+| --- | --- |
+| `${FOO%suffix}` | Remove suffix |
+| `${FOO#prefix}` | Remove prefix |
+| --- | --- |
+| `${FOO%%suffix}` | Remove long suffix |
+| `${FOO##prefix}` | Remove long prefix |
+| --- | --- |
+| `${FOO/from/to}` | Replace first match |
+| `${FOO//from/to}` | Replace all |
+| --- | --- |
+| `${FOO/%from/to}` | Replace suffix |
+| `${FOO/#from/to}` | Replace prefix |
+
+### Substrings
+
+| `${FOO:0:3}` | Substring _(position, length)_ |
+| `${FOO:-3:3}` | Substring from the right |
+
+### Length
+
+| `${#FOO}` | Length of `$FOO` |
+
+### Default values
+
+| `${FOO:-val}` | `$FOO`, or `val` if not set |
+| `${FOO:=val}` | Set `$FOO` to `val` if not set |
+| `${FOO:+val}` | `val` if `$FOO` is set |
+| `${FOO:?message}` | Show error message ande xit if `$FOO` is not set |
+
+The `:` is optional (eg, `${FOO=word}` works)
+
+Loops
+-----
+{: .-three-column}
+
+### Basic for loop
+
+```bash
+for i in /etc/rc.*; do
+ echo $i
+done
+```
+
+### Ranges
+
+```bash
+for i in {1..5}; do
+ echo "Welcome $i"
+done
+```
+
+### Reading lines
+
+```bash
+cat file.txt | while read line; do
+ echo $line
+done
+```
+
+### Forever
+
+```bash
+while true; do
+ ···
+done
+```
+
+Functions
+---------
+{: .-three-column}
+
+### Defining functions
+
+```bash
+myfunc() {
+ echo "hello $1"
+}
+```
+
+```bash
+# Same as above (alternate syntax)
+function myfunc() {
+ echo "hello $1"
+}
+```
+
+```bash
+myfunc "John"
+```
+
+### Returning values
+
+```bash
+myfunc() {
+ local myresult='some value'
+ echo $myresult
+}
+```
+
+```bash
+result=$(myfunc)
+```
+
+### Raising errors
+
+```bash
+myfunc() {
+ return 1
+}
+```
+
+```bash
+if myfunc; then
+ echo "success"
+else
+ echo "failure"
+fi
+```
+
+### Arguments
+
+| Expression | Description |
+| --- | --- |
+| `$#` | Number of arguments |
+| `$*` | All arguments |
+| `$@` | All arguments, starting from first |
+| `$1` | First argument |
+
+See [Special parameters](http://wiki.bash-hackers.org/syntax/shellvars#special_parameters_and_shell_variables).
+
+Conditionals
+------------
+{: .-three-column}
+
+### Conditions
+
+| Condition | Description |
+| --- | --- |
+| `[ -z STRING ]` | Empty string |
+| `[ -n STRING ]` | Not empty string |
+| --- | --- |
+| `[ NUM -eq NUM ]` | Equal |
+| `[ NUM -ne NUM ]` | Not equal |
+| `[ NUM -lt NUM ]` | Less than |
+| `[ NUM -le NUM ]` | Less than or equal |
+| `[ NUM -gt NUM ]` | Greater than |
+| `[ NUM -ge NUM ]` | Greater than or equal |
+| --- | --- |
+| `[[ STRING =~ STRING ]]` | Regexp |
+| --- | --- |
+| `(( NUM < NUM ))` | Numeric conditions |
+
+| Condition | Description |
+| --- | --- |
+| `[ -o noclobber ]` | If OPTIONNAME is enabled |
+| --- | --- |
+| `[ ! EXPR ]` | Not |
+| `[ X ] && [ Y ]` | And |
+| `[ X ] || [ Y ]` | Or |
+
+### File conditions
+
+| Condition | Description |
+| --- | --- |
+| `[ -e FILE ]` | Exists |
+| `[ -r FILE ]` | Readable |
+| `[ -h FILE ]` | Symlink |
+| `[ -d FILE ]` | Directory |
+| `[ -w FILE ]` | Writable |
+| `[ -s FILE ]` | Size is > 0 bytes |
+| `[ -f FILE ]` | File |
+| `[ -x FILE ]` | Executable |
+| --- | --- |
+| `[ FILE1 -nt FILE2 ]` | 1 is more recent than 2 |
+| `[ FILE1 -ot FILE2 ]` | 2 is more recent than 1 |
+| `[ FILE1 -ef FILE2 ]` | Same files |
+
+### Example
+
+```bash
+# String
+if [ -z "$string" ]; then
+ echo "String is empty"
+elsif [ -n "$string" ]; then
+ echo "String is not empty"
+fi
+```
+
+```bash
+# Combinations
+if [ X ] && [ Y ]; then
+ ...
+fi
+```
+
+```bash
+# Regex
+if [[ "A" =~ "." ]]
+```
+
+```bash
+if (( $a < $b ))
+```
+
+```bash
+if [ -e "file.txt" ]; then
+ echo "file exists"
+fi
+```
+
+Arrays
+------
+
+### Defining arrays
+
+```bash
+Fruits=('Apple' 'Banana' 'Orange')
+```
+
+```bash
+Fruits[0]="Apple"
+Fruits[1]="Banana"
+Fruits[2]="Orange"
+```
+
+### Working with arrays
+
+```bash
+echo ${Fruits[0]} # Element #0
+echo ${Fruits[@]} # All elements, space-separated
+echo ${#Fruits[@]} # Number of elements
+echo ${#Fruits} # String length of the 1st element
+echo ${#Fruits[3]} # String length of the Nth element
+echo ${Fruits[@]:3:2} # Range (from position 3, length 2)
+```
+
+### Operations
+
+```bash
+Fruits=("${Fruits[@]}" "Watermelon") # Push
+Fruits=( ${Fruits[@]/Ap*/} ) # Remove by regex match
+unset Fruits[2] # Remove one item
+Fruits=("${Fruits[@]}") # Duplicate
+Fruits=("${Fruits[@]}" "${Veggies[@]}") # Concatenate
+lines=(`cat "logfile"`) # Read from file
+```
+
+### Iteration
+
+```bash
+for i in "${arrayName[@]}"; do
+ echo $i
+done
+```
+
+Options
+-------
+
+### Options
+
+```bash
+set -o noclobber # Avoid overlay files (echo "hi" > foo)
+set -o errexit # Used to exit upon error, avoiding cascading errors
+set -o pipefail # Unveils hidden failures
+set -o nounset # Exposes unset variables
+```
+
+### Glob options
+
+```bash
+set -o nullglob # Non-matching globs are removed ('*.foo' => '')
+set -o failglob # Non-matching globs throw errors
+set -o nocaseglob # Case insensitive globs
+set -o globdots # Wildcards match dotfiles ("*.sh" => ".foo.sh")
+set -o globstar # Allow ** for recursive matches ('lib/**/*.rb' => 'lib/a/b/c.rb')
+```
+
+Set `GLOBIGNORE` as a colon-separated list of patterns to be removed from glob
+matches.
+
+Miscellaneous
+-------------
+
+### Numeric calculations
+
+```bash
+$((a + 200)) # Add 200 to $a
+```
+
+```bash
+$((RANDOM%=200)) # Random number 0..200
+```
+
+### Subshells
+
+```bash
+(cd somedir; echo "I'm now in $PWD")
+pwd # still in first directory
+```
+
+### Redirection
+
+```bash
+python hello.py > output.txt # stdout to (file)
+python hello.py >> output.txt # stdout to (file), append
+python hello.py 2> error.log # stderr to (file)
+python hello.py 2>&1 # stderr to stdout
+python hello.py 2>/dev/null # stderr to (null)
+```
+
+```bash
+python hello.py < foo.txt
+```
+
+### Inspecting commands
+
+```bash
+command -V cd
+#=> "cd is a function/alias/whatever"
+```
+
+### Trap errors
+
+```bash
+trap 'echo Error at about $LINENO' ERR
+```
+
+or
+
+```bash
+traperr() {
+ echo "ERROR: ${BASH_SOURCE[1]} at about ${BASH_LINENO[0]}"
+}
+
+set -o errtrace
+trap traperr ERR
+```
+
+### Case/switch
+
+```bash
+case "$1" in
+ start | up)
+ vagrant up
+ ;;
+
+ *)
+ echo "Usage: $0 {start|stop|ssh}"
+ ;;
+esac
+```
+
+### Source relative
+
+```bash
+source "${0%/*}/../share/foo.sh"
+```
+
+### printf
+
+```bash
+printf "Hello %s, I'm %s" Sven Olga
+#=> "Hello Sven, I'm Olga
+```
+
+### Directory of script
+
+```bash
+DIR="${0%/*}"
+```
+
+### Getting options
+
+```bash
+while [[ "$1" =~ ^- && ! "$1" == "--" ]]; do case $1 in
+ -V | --version )
+ echo $version
+ exit
+ ;;
+ -s | --string )
+ shift; string=$1
+ ;;
+ -f | --flag )
+ flag=1
+ ;;
+esac; shift; done
+if [[ "$1" == '--' ]]; then shift; fi
+```
+
+### Heredoc
+
+```sh
+cat < Hi John
-echo 'Hi $NAME' #=> Hi $NAME
-```
-
-### Shell execution
-
-```bash
-echo "I'm in $(pwd)"
-echo "I'm in `pwd`"
-# Same
-```
-
-See [Command substitution](http://wiki.bash-hackers.org/syntax/expansion/cmdsubst)
-
-### Conditional execution
-
-```bash
-git commit && git push
-git commit || echo "Commit failed"
-```
-
-### Functions
-{: id='functions-example'}
-
-```bash
-get_name() {
- echo "John"
-}
-
-echo "You are $(get_name)"
-```
-
-See: [Functions](#functions)
-
-### Conditionals
-{: id='conditionals-example'}
-
-```bash
-if [ -z "$string" ]; then
- echo "String is empty"
-elsif [ -n "$string" ]; then
- echo "String is not empty"
-fi
-```
-
-See: [Conditionals](#conditionals)
-
-### Strict mode
-
-```bash
-set -euo pipefail
-IFS=$'\n\t'
-```
-
-See: [Unofficial bash strict mode](http://redsymbol.net/articles/unofficial-bash-strict-mode/)
-
-### Brace expansion
-
-```bash
-echo {A,B}.js
-```
-
-| `{A,B}` | Same as `A B` |
-| `{A,B}.js` | Same as `A.js B.js` |
-| `{1..5}` | Same as `1 2 3 4 5` |
-
-See: [Brace expansion](http://wiki.bash-hackers.org/syntax/expansion/brace)
-
-
-Parameter expansions
---------------------
-{: .-three-column}
-
-### Basics
-
-```bash
-name="John"
-echo ${name}
-echo ${name/J/j} #=> "john" (substitution)
-echo ${name:0:2} #=> "jo" (slicing)
-echo ${food:-Cake} #=> $food or "Cake"
-```
-
-```bash
-length=2
-echo ${name:0:length} #=> "jo"
-```
-
-See: [Parameter expansion](http://wiki.bash-hackers.org/syntax/pe)
-
-```bash
-STR="/path/to/foo.cpp"
-echo ${STR%.cpp} # /path/to/foo
-echo ${STR%.cpp}.o # /path/to/foo.o
-
-echo ${STR##*.} # cpp (extension)
-echo ${STR##*/} # foo.cpp (basepath)
-
-echo ${STR#*/} # path/to/foo.cpp
-echo ${STR##*/} # foo.cpp
-
-echo ${STR/foo/bar} # /path/to/bar.cpp
-```
-
-```bash
-STR="Hello world"
-echo ${STR:6:5} # "world"
-echo ${STR:-5:5} # "world"
-```
-
-```bash
-SRC="/path/to/foo.cpp"
-BASE=${STR##*/} #=> "foo.cpp" (basepath)
-DIR=${SRC%$BASE} #=> "/path/to" (dirpath)
-```
-
-### Substitution
-
-| Code | Description |
-| --- | --- |
-| `${FOO%suffix}` | Remove suffix |
-| `${FOO#prefix}` | Remove prefix |
-| --- | --- |
-| `${FOO%%suffix}` | Remove long suffix |
-| `${FOO##prefix}` | Remove long prefix |
-| --- | --- |
-| `${FOO/from/to}` | Replace first match |
-| `${FOO//from/to}` | Replace all |
-| --- | --- |
-| `${FOO/%from/to}` | Replace suffix |
-| `${FOO/#from/to}` | Replace prefix |
-
-### Substrings
-
-| `${FOO:0:3}` | Substring _(position, length)_ |
-| `${FOO:-3:3}` | Substring from the right |
-
-### Length
-
-| `${#FOO}` | Length of `$FOO` |
-
-### Default values
-
-| `${FOO:-val}` | `$FOO`, or `val` if not set |
-| `${FOO:=val}` | Set `$FOO` to `val` if not set |
-| `${FOO:+val}` | `val` if `$FOO` is set |
-| `${FOO:?message}` | Show error message ande xit if `$FOO` is not set |
-
-The `:` is optional (eg, `${FOO=word}` works)
-
-Loops
------
-{: .-three-column}
-
-### Basic for loop
-
-```bash
-for i in /etc/rc.*; do
- echo $i
-done
-```
-
-### Ranges
-
-```bash
-for i in {1..5}; do
- echo "Welcome $i"
-done
-```
-
-### Reading lines
-
-```bash
-cat file.txt | while read line; do
- echo $line
-done
-```
-
-### Forever
-
-```bash
-while true; do
- ···
-done
-```
-
-Functions
----------
-{: .-three-column}
-
-### Defining functions
-
-```bash
-myfunc() {
- echo "hello $1"
-}
-```
-
-```bash
-# Same as above (alternate syntax)
-function myfunc() {
- echo "hello $1"
-}
-```
-
-```bash
-myfunc "John"
-```
-
-### Returning values
-
-```bash
-myfunc() {
- local myresult='some value'
- echo $myresult
-}
-```
-
-```bash
-result=$(myfunc)
-```
-
-### Raising errors
-
-```bash
-myfunc() {
- return 1
-}
-```
-
-```bash
-if myfunc; then
- echo "success"
-else
- echo "failure"
-fi
-```
-
-### Arguments
-
-| Expression | Description |
-| --- | --- |
-| `$#` | Number of arguments |
-| `$*` | All arguments |
-| `$@` | All arguments, starting from first |
-| `$1` | First argument |
-
-See [Special parameters](http://wiki.bash-hackers.org/syntax/shellvars#special_parameters_and_shell_variables).
-
-Conditionals
-------------
-{: .-three-column}
-
-### Conditions
-
-| Condition | Description |
-| --- | --- |
-| `[ -z STRING ]` | Empty string |
-| `[ -n STRING ]` | Not empty string |
-| --- | --- |
-| `[ NUM -eq NUM ]` | Equal |
-| `[ NUM -ne NUM ]` | Not equal |
-| `[ NUM -lt NUM ]` | Less than |
-| `[ NUM -le NUM ]` | Less than or equal |
-| `[ NUM -gt NUM ]` | Greater than |
-| `[ NUM -ge NUM ]` | Greater than or equal |
-| --- | --- |
-| `[[ STRING =~ STRING ]]` | Regexp |
-| --- | --- |
-| `(( NUM < NUM ))` | Numeric conditions |
-
-| Condition | Description |
-| --- | --- |
-| `[ -o noclobber ]` | If OPTIONNAME is enabled |
-| --- | --- |
-| `[ ! EXPR ]` | Not |
-| `[ X ] && [ Y ]` | And |
-| `[ X ] || [ Y ]` | Or |
-
-### File conditions
-
-| Condition | Description |
-| --- | --- |
-| `[ -e FILE ]` | Exists |
-| `[ -r FILE ]` | Readable |
-| `[ -h FILE ]` | Symlink |
-| `[ -d FILE ]` | Directory |
-| `[ -w FILE ]` | Writable |
-| `[ -s FILE ]` | Size is > 0 bytes |
-| `[ -f FILE ]` | File |
-| `[ -x FILE ]` | Executable |
-| --- | --- |
-| `[ FILE1 -nt FILE2 ]` | 1 is more recent than 2 |
-| `[ FILE1 -ot FILE2 ]` | 2 is more recent than 1 |
-| `[ FILE1 -ef FILE2 ]` | Same files |
-
-### Example
-
-```bash
-# String
-if [ -z "$string" ]; then
- echo "String is empty"
-elsif [ -n "$string" ]; then
- echo "String is not empty"
-fi
-```
-
-```bash
-# Combinations
-if [ X ] && [ Y ]; then
- ...
-fi
-```
-
-```bash
-# Regex
-if [[ "A" =~ "." ]]
-```
-
-```bash
-if (( $a < $b ))
-```
-
-```bash
-if [ -e "file.txt" ]; then
- echo "file exists"
-fi
-```
-
-Arrays
-------
-
-### Defining arrays
-
-```bash
-Fruits=('Apple' 'Banana' 'Orange')
-```
-
-```bash
-Fruits[0]="Apple"
-Fruits[1]="Banana"
-Fruits[2]="Orange"
-```
-
-### Working with arrays
-
-```bash
-echo ${Fruits[0]} # Element #0
-echo ${Fruits[@]} # All elements, space-separated
-echo ${#Fruits[@]} # Number of elements
-echo ${#Fruits} # String length of the 1st element
-echo ${#Fruits[3]} # String length of the Nth element
-echo ${Fruits[@]:3:2} # Range (from position 3, length 2)
-```
-
-### Operations
-
-```bash
-Fruits=("${Fruits[@]}" "Watermelon") # Push
-Fruits=( ${Fruits[@]/Ap*/} ) # Remove by regex match
-unset Fruits[2] # Remove one item
-Fruits=("${Fruits[@]}") # Duplicate
-Fruits=("${Fruits[@]}" "${Veggies[@]}") # Concatenate
-lines=(`cat "logfile"`) # Read from file
-```
-
-### Iteration
-
-```bash
-for i in "${arrayName[@]}"; do
- echo $i
-done
-```
-
-Options
--------
-
-### Options
-
-```bash
-set -o noclobber # Avoid overlay files (echo "hi" > foo)
-set -o errexit # Used to exit upon error, avoiding cascading errors
-set -o pipefail # Unveils hidden failures
-set -o nounset # Exposes unset variables
-```
-
-### Glob options
-
-```bash
-set -o nullglob # Non-matching globs are removed ('*.foo' => '')
-set -o failglob # Non-matching globs throw errors
-set -o nocaseglob # Case insensitive globs
-set -o globdots # Wildcards match dotfiles ("*.sh" => ".foo.sh")
-set -o globstar # Allow ** for recursive matches ('lib/**/*.rb' => 'lib/a/b/c.rb')
-```
-
-Set `GLOBIGNORE` as a colon-separated list of patterns to be removed from glob
-matches.
-
-Miscellaneous
--------------
-
-### Numeric calculations
-
-```bash
-$((a + 200)) # Add 200 to $a
-```
-
-```bash
-$((RANDOM%=200)) # Random number 0..200
-```
-
-### Subshells
-
-```bash
-(cd somedir; echo "I'm now in $PWD")
-pwd # still in first directory
-```
-
-### Redirection
-
-```bash
-python hello.py > output.txt # stdout to (file)
-python hello.py >> output.txt # stdout to (file), append
-python hello.py 2> error.log # stderr to (file)
-python hello.py 2>&1 # stderr to stdout
-python hello.py 2>/dev/null # stderr to (null)
-```
-
-```bash
-python hello.py < foo.txt
-```
-
-### Inspecting commands
-
-```bash
-command -V cd
-#=> "cd is a function/alias/whatever"
-```
-
-### Trap errors
-
-```bash
-trap 'echo Error at about $LINENO' ERR
-```
-
-or
-
-```bash
-traperr() {
- echo "ERROR: ${BASH_SOURCE[1]} at about ${BASH_LINENO[0]}"
-}
-
-set -o errtrace
-trap traperr ERR
-```
-
-### Case/switch
-
-```bash
-case "$1" in
- start | up)
- vagrant up
- ;;
-
- *)
- echo "Usage: $0 {start|stop|ssh}"
- ;;
-esac
-```
-
-### Source relative
-
-```bash
-source "${0%/*}/../share/foo.sh"
-```
-
-### printf
-
-```bash
-printf "Hello %s, I'm %s" Sven Olga
-#=> "Hello Sven, I'm Olga
-```
-
-### Directory of script
-
-```bash
-DIR="${0%/*}"
-```
-
-### Getting options
-
-```bash
-while [[ "$1" =~ ^- && ! "$1" == "--" ]]; do case $1 in
- -V | --version )
- echo $version
- exit
- ;;
- -s | --string )
- shift; string=$1
- ;;
- -f | --flag )
- flag=1
- ;;
-esac; shift; done
-if [[ "$1" == '--' ]]; then shift; fi
-```
-
-### Heredoc
-
-```sh
-cat <