Linux command-line tips and tricks
More at commandlinefu.com
Download and unpack a tarball without leaving it on your hard drive (via)¶
curl http://example.com/path/to/blah.tar.gz | tar xz
Remove a line matching a pattern from a file¶
Assume GNU sed
$ sed -i".bak" '/pattern to match/d' filename.txt
Remove a line from multiple files¶
$ for filepath in $( find . -name '*.yaml' ); do sed -i '/pattern to match/d' $filepath; done
How to recursively remove empty files¶
$ find . -size -0 | xargs rm
Better way via http://www.thegeekstuff.com/2010/03/find-empty-directories-and-files/
$ find . -empty -type f | xargs rm
Keep only lines matching a pattern in multiple files
$ for dirname in $( ls ); do grep -E '(pattern of lines to keep)' "$dirname/common_filename.csv" > "../tmp/${dirname}_common_filename.csv"; done
Test sendmail from the command line
$ echo "Subject: test from eliot" | sendmail -v [email protected]
Create a sequence of dated directories from 20111119 to 20111130¶
$ for i in `seq 19 30`; do mkdir "201111$i"; done
