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Create an array of CPU frequencies in GHz$ cpus=($({ echo scale=2; awk '/cpu MHz/ {print $4 " / 1000"}' /proc/cpuinfo; } | bc)) |
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Test git archive before actually creating an archive // fake dry run$ git archive master some/project/subdir | tar t |
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Shuffle lines$ seq 5 | shuf |
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Print the window title of current mpv session to display what is playing$ wmctrl -pl | grep $(pidof mpv) | cut -d- -f2- |
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Shuffle lines$ ... | perl -MList::Util -e 'print List::Util::shuffle <>' |
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Open Windows internet shortcut (*.url) files in firefox$ firefox $(grep -i ^url='*' file.url | cut -b 5-) |
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Check if a file exists and has a size greater than X$ [[ $(find /path/to/file -type f -size +51200c 2>/dev/null) ]] && echo true || echo false |
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Replace sequences of the same characters with a single character$ echo heeeeeeelllo | sed 's/\(.\)\1\+/\1/g' |
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Count the lines of each file extension in a list of files$ git ls-files | xargs wc -l | awk -F ' +|\\.|/' '{ sumlines[$NF] += $2 } END { for (ext in sumlines) print ext, sumlines[ext] }' |
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Add all unknown files in a Subversion checkout$ svn add . --force |
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Find files that are not executable$ find /some/path -type f ! -perm -111 -ls |
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Create a heap dump of a Java process$ jmap -dump:format=b,file=/var/tmp/dump.hprof 1234 |
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Insert lines from one text file to another one$ awk 'NR % 10 == 1 {getline f2 < "file1"; print f2} 1' file2 | cat -n |
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Check that a directory is a parent of another$ is_parent() { [[ "$2" =~ $1/? ]]; } |
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Create fattal tone mapped images from a directory of raw images$ for img in /path/to/rawimages/*.RW2; do pfsin ${img} | pfssize -x 1024 -y 768 | pfstmo_fattal02 -v -s 1 | pfsout /path/to/finished/${img%%}.jpg; done |
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Calculate md5sum from an input string$ md5sum <<< YOUR_TEXT | cut -f1 -d' ' |
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Get streamed FLV from Chrome with lsof$ export psid=$(pgrep -f libflashplayer.so); cp /proc/$psid/fd/$(lsof -p $psid | grep eleted | awk {' print $4 '} | sed -e "s/[a-z]//g") saved.flv |
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Rename all files in a directory to upper case$ for i in *; do mv "$i" "${i^^}"; done |
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Print file owners and permissions of a directory tree$ find /path/to/dir1 -printf "%U %G %m %p\n" > /tmp/dir1.txt |
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Get only the latest version of a file from across mutiple directories$ find . -name custlist\* | perl -ne '$path = $_; s?.*/??; $name = $_; $map{$name} = $path; ++$c; END { print $map{(sort(keys(%map)))[$c-1]} }' |
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Recreate or update an existing zip file and remove files that do not exist anymore$ zip --filesync -r /path/to/out.zip /path/to/dir |
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How to expand a CIDR notation to its IPs$ for j in $(seq 0 255); do for i in $(seq 0 255) ; do seq -f "10.$j.$i.%g" 0 255; done; done |
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Make the output of the `time` builtin easier to parse$ TIMEFORMAT=%R |
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Remove EXIF data such as orientation from images$ mogrify -strip /path/to/image.jpg |
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Get the last modification date of a file in any format you want$ date -r /etc/motd +%Y%m%d_%H%M%S |