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1
score
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Re-compress a gzip (.gz) file to a bzip2 (.bz2) file$ time gzip -cd file1.tar.gz 2>~/logfile.txt | pv -t -r -b -W -i 5 -B 8M | bzip2 > file1.tar.bz2 2>>~/logfile .txt |
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1
score
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Test your hard drive speed$ time (dd if=/dev/zero of=zerofile bs=1M count=500;sync);rm zerofile |
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1
score
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Recursively remove all empty sub-directories from a directory tree$ find . -depth -type d -empty -exec rmdir {} \; |
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1
score
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Group count sort a log file$ A=$(FILE=/var/log/myfile.log; cat $FILE | perl -p -e 's/.*,([A-Z]+)[\:\+].*/$1/g' | sort -u | while read LINE; do grep "$LINE" $FILE | wc -l | perl -p -e 's/[^0-9]+//g'; echo -e "\t$LINE"; done;);echo "$A"|sort -nr |
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1
score
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Use ghostscript to shrink PDF files$ gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf |
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1
score
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How to find all hard links to a file$ find /home -xdev -samefile file1 |
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1
score
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Find all the unique 4-letter words in a text$ cat ipsum.txt | perl -ne 'print map("$_\n", m/\w+/g);' | tr A-Z a-z | sort | uniq | awk 'length($1) == 4 {print}' |
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1
score
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Concatenate two or more movie files into one using mencoder$ mencoder cd1.avi cd2.avi -o movie.avi -ovc copy -oac copy |
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1
score
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Calculate the average execution time (of short running scripts) with awk$ for i in {1..10}; do time some_script.sh; done 2>&1 | grep ^real | sed -e s/.*m// | awk '{sum += $1} END {print sum / NR}' |
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1
score
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1
score
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Rotate a movie file with mencoder$ mencoder video.avi -o rotated-right.avi -oac copy -ovc lavc -vf rotate=1 |
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1
score
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View specific column of data from a large file with long lines$ cat /tmp/log.data |colrm 1 155|colrm 60 300 |
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1
score
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Replace a regexp pattern in many files at once$ vi +'bufdo %s/pattern/replacement/g | update' +q $(grep -rl pattern /path/to/dir) |
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0
score
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Listen to a song from youtube$ listen-to-yt() { if [[ -z "$1" ]]; then echo "Enter a search string!"; else mpv "$(youtube-dl --default-search 'ytsearch1:' \"$1\" --get-url | tail -1)"; fi } |
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0
score
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Generate a sequence of numbers$ perl -e 'print "$_\n" for (1..10);' |
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0
score
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Find all of the distinct file extensions in a folder$ find . -type f | perl -ne 'print $1 if m/\.([^.\/]+)$/' | sort -u |
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-1
score
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Generate a sequence of numbers$ seq 1 10 |
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-1
score
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Delete all untagged Docker images$ docker rmi $(docker images -f "dangling=true" -q) |
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-1
score
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Get a free shell account on a community server$ sh <(curl hashbang.sh | gpg) |
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-1
score
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Run a local shell script on a remote server without copying it there$ ssh user@server bash < /path/to/local/script.sh |
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0
score
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Prints "Good" in green if the sha256 sum of a file matches the sum listed in a dist/checksum file and "Bad" in red if it does not match$ [[ $(sha256sum _downloaded_file_ | cut -d' ' -f 1) == $(grep -Po '\b[a-zA-Z0-9]{64}\b' _checksum_fle_) ]] && printf "\033[0;32mGood" || printf "\033[0;31mBad" |
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0
score
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(Pseudo)random 6-digit number$ let N=0 N=N+10**{0..5}*${RANDOM:0:1} |
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0
score
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Compute factorial of positive integer using only built-ins$ factorial() { eval let N=1 N*={1..$1} ; echo $N; } |
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0
score
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Recursively compute factorial of positive integer using only built-ins$ factorial() { [ "$1" = "0" ] && echo ${2:-1} || factorial $(( $1 - 1 )) $(( ${2:-1} * $1 )); } |
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0
score
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Using a single sudo to run multiple && arguments$ sudo -s <<< 'apt update -y && apt upgrade -y' |