|
Size: 937
Comment: converted to 1.6 markup
|
Size: 1407
Comment: first-line; also expand to include simpler options
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 2: | Line 2: |
| == How can I use a logical AND in a shell pattern (glob)? == | == How can I use a logical AND/OR/NOT in a shell pattern (glob)? == [[glob|"Globs"]] are simple patterns that can be used to match filenames or strings. They're generally not very powerful. If you need more power, there are a few options available. |
| Line 4: | Line 5: |
| [[glob|"Globs"]] are simple patterns that can be used to match filenames or strings. They're generally not very powerful. If you need more power, you can use ''extended globs''. In [[BASH]], you'll need the {{{extglob}}} option to be set. It can be checked with: | If you want to operate on all the files that match glob A ''or'' glob B, just put them both on the same command line: |
| Line 6: | Line 8: |
| $ shopt extglob | rm *.bak *.old }}} If you want to use a logical OR in just part of a glob (larger than a single charcter -- for which square-bracketed character classes suffice), in Bash, you can use BraceExpansion: {{{ rm *.{bak,old} }}} If you need something still more general/powerful, in KornShell or [[BASH]] you can use ''extended globs''. In Bash, you'll need the {{{extglob}}} option to be set. It can be checked with: {{{ shopt extglob |
| Line 11: | Line 25: |
| $ shopt -s extglob | shopt -s extglob |
| Line 16: | Line 30: |
| $ mv foo!(*.d) foo_thursday.d | mv foo!(*.d) foo_thursday.d |
| Line 22: | Line 36: |
| $ rm !(!(*Pink_Floyd*)|*The_Final_Cut*) | rm !(!(*Pink_Floyd*)|*The_Final_Cut*) |
How can I use a logical AND/OR/NOT in a shell pattern (glob)?
"Globs" are simple patterns that can be used to match filenames or strings. They're generally not very powerful. If you need more power, there are a few options available.
If you want to operate on all the files that match glob A or glob B, just put them both on the same command line:
rm *.bak *.old
If you want to use a logical OR in just part of a glob (larger than a single charcter -- for which square-bracketed character classes suffice), in Bash, you can use BraceExpansion:
rm *.{bak,old}If you need something still more general/powerful, in KornShell or BASH you can use extended globs. In Bash, you'll need the extglob option to be set. It can be checked with:
shopt extglob
and set with:
shopt -s extglob
To warm up, we'll move all files starting with foo AND not ending with .d to directory foo_thursday.d:
mv foo!(*.d) foo_thursday.d
A more complex example -- delete all files containing Pink_Floyd AND not containing The_Final_Cut:
rm !(!(*Pink_Floyd*)|*The_Final_Cut*)
By the way: these kind of patterns can be used with the KornShell, too. They don't have to be enabled there, but are the default patterns.
For a more thorough explanation of extended globs, see glob.