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Alert me by email when a disconnected or unreachable server comes back online$ while ! ping -c1 the_host_down; do sleep 1; done && date | mail -s 'the host is back!' me@example.com |
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Add timestamp to the output of ping$ ping some_host | while read LINE; do echo $(date): $LINE; done |
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Test a one-liner with echo commands first, pipe to bash when ready$ paste <(ls) <(ls | tr A-Z a-z) | while read OLD NEW; do echo mv -v $OLD $NEW; done | sh |
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Find the most recently modified files in a directory and all subdirectories$ find /path/to/dir -type f | perl -ne 'chomp(@files = <>); my $p = 9; foreach my $f (sort { (stat($a))[$p] <=> (stat($b))[$p] } @files) { print scalar localtime((stat($f))[$p]), "\t", $f, "\n" }' | tail |
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Delete unversioned files in a Subversion checkout directory and all subdirectories$ svn st | grep ^? | sed -e 's/^? *//' | xargs -i{} echo rm -fr "{}" |
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Get the available space on a partition as a single numeric value$ df /path/to/dir | sed -ne 2p | awk '{print $4}' |
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Schedule a one-time task using "at" command and intuitive date specifications$ at now + 30 minutes |
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Aliases the ls command to display the way I like it$ alias ls='ls -lhGpt --color=always' |
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Find video files cached by the flash plugin in browsers$ file /proc/*/fd/* 2>/dev/null | grep Flash | cut -f1 -d: |
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Force the preferred language when downloading a web page with wget$ wget -–header='Accept-Language: en-us' http://www.timeanddate.com/calendar/index.html?year=2008&country=26 -O calendar.html |
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Burn the contents of a directory to dvd without needing a gui application$ growisofs -dvd-compat -Z /dev/scd0 -R -J -pad /path/to/dir |
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Convert all flac files in the current directory to mp3 format using "lame"$ for i in *.flac; do flac -c -d "$i" | lame -m j -b 192 -s 44.1 - "${i%.flac}.mp3"; done |
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Halt the system in Linux without the halt command or gui$ echo o > /proc/sysrq-trigger |
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Create an encrypted tar file with openssl$ tar c paths_to_files_and_dirs | gzip -c | openssl des3 > encrypted.tar.gz |
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Make another user superuser in Ubuntu$ for i in $(grep :boss /etc/group | cut -f1 -d:); do adduser wife $i; done |
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Change the label of a USB drive in Linux without a gui$ sudo mlabel -i /dev/sdd1 ::NewLabel |
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Mirror from one Subversion repository to another Subversion repository$ bzr co https://repo1/proj1/trunk proj1 && cd proj1 && bzr push https://repo2/vendor/proj1/trunk |
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Find Flash videos stored by browsers on a Mac$ find /private/ 2>/dev/null | grep /Flash |