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cheatsheets
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Merge pull request #1383 from zhumengu/master

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Rico Sta. Cruz 2020-06-14 23:55:27 +10:00 committed by GitHub
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@ -138,6 +138,7 @@ See: [Parameter expansion](http://wiki.bash-hackers.org/syntax/pe)
STR="/path/to/foo.cpp" STR="/path/to/foo.cpp"
echo ${STR%.cpp} # /path/to/foo echo ${STR%.cpp} # /path/to/foo
echo ${STR%.cpp}.o # /path/to/foo.o echo ${STR%.cpp}.o # /path/to/foo.o
echo ${STR%/*} # /path/to
echo ${STR##*.} # cpp (extension) echo ${STR##*.} # cpp (extension)
echo ${STR##*/} # foo.cpp (basepath) echo ${STR##*/} # foo.cpp (basepath)
@ -571,21 +572,25 @@ History
### Operations ### Operations
| `!!` | Execute last command again | | Code | Description |
| `!!:s/<FROM>/<TO>/` | Replace first occurrence of `<FROM>` to `<TO>` in most recent command | | -------------------- | --------------------------------------------------------------------- |
| `!!:gs/<FROM>/<TO>/` | Replace all occurrences of `<FROM>` to `<TO>` in most recent command | | `!!` | Execute last command again |
| `!$:t` | Expand only basename from last parameter of most recent command | | `!!:s/<FROM>/<TO>/` | Replace first occurrence of `<FROM>` to `<TO>` in most recent command |
| `!$:h` | Expand only directory from last parameter of most recent command | | `!!:gs/<FROM>/<TO>/` | Replace all occurrences of `<FROM>` to `<TO>` in most recent command |
| `!$:t` | Expand only basename from last parameter of most recent command |
| `!$:h` | Expand only directory from last parameter of most recent command |
`!!` and `!$` can be replaced with any valid expansion. `!!` and `!$` can be replaced with any valid expansion.
### Slices ### Slices
| `!!:n` | Expand only `n`th token from most recent command (command is `0`; first argument is `1`) | | Code | Description |
| `!^` | Expand first argument from most recent command | | -------- | ---------------------------------------------------------------------------------------- |
| `!$` | Expand last token from most recent command | | `!!:n` | Expand only `n`th token from most recent command (command is `0`; first argument is `1`) |
| `!!:n-m` | Expand range of tokens from most recent command | | `!^` | Expand first argument from most recent command |
| `!!:n-$` | Expand `n`th token to last from most recent command | | `!$` | Expand last token from most recent command |
| `!!:n-m` | Expand range of tokens from most recent command |
| `!!:n-$` | Expand `n`th token to last from most recent command |
`!!` can be replaced with any valid expansion i.e. `!cat`, `!-2`, `!42`, etc. `!!` can be replaced with any valid expansion i.e. `!cat`, `!-2`, `!42`, etc.