|
1
score
|
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 |
|
1
score
|
Test your hard drive speed$ time (dd if=/dev/zero of=zerofile bs=1M count=500;sync);rm zerofile |
|
1
score
|
Recursively remove all empty sub-directories from a directory tree$ find . -depth -type d -empty -exec rmdir {} \; |
|
1
score
|
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 "$A"|sort -nr |
|
1
score
|
Use ghostscript to shrink PDF files$ gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf |
|
1
score
|
How to find all hard links to a file$ find /home -xdev -samefile file1 |
|
1
score
|
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($1) == 4 {print}' |
|
1
score
|
Concatenate two or more movie files into one using mencoder$ mencoder cd1.avi cd2.avi -o movie.avi -ovc copy -oac copy |
|
1
score
|
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 += $1} END {print sum / NR}' |
|
1
score
|
|
1
score
|
Rotate a movie file with mencoder$ mencoder video.avi -o rotated-right.avi -oac copy -ovc lavc -vf rotate=1 |
|
1
score
|
View specific column of data from a large file with long lines$ cat /tmp/log.data |colrm 1 155|colrm 60 300 |
|
1
score
|
Replace a regexp pattern in many files at once$ vi +'bufdo %s/pattern/replacement/g | update' +q $(grep -rl pattern /path/to/dir) |
|
-1
score
|
Delete all untagged Docker images$ docker rmi $(docker images -f "dangling=true" -q) |
|
-1
score
|
Get a free shell account on a community server$ sh <(curl hashbang.sh | gpg) |
|
-1
score
|
Run a local shell script on a remote server without copying it there$ ssh user@server bash < /path/to/local/script.sh |
|
0
score
|
List docker log sizes and remind how to empty them$ docker ps -qa | xargs docker inspect --format='{{.LogPath}}' | xargs sudo du -hl; sleep 1; printf "\r\n echo '' > \$(docker inspect --format={{.LogPath}} container_name_or_id) \r\n*****COPY****ABOVE****TO******CLEAR*****LOG*****CHANGE***CONTAINER_ID******* \r\n \n" |
|
0
score
|
Extract audio only from video files using ffmpeg$ ffmpeg -i video.any -vn -acodec libvorbis audio.ogg |
|
0
score
|
Print the list of your Git commits this month$ git log --since='last month' --author="$(git config user.name)" --oneline |
|
0
score
|
Store the output of find in an array$ mapfile -d $'\0' arr < <(find /path/to -print0) |
|
0
score
|
Check if a text snippet is valid C code$ gcc -fsyntax-only -xc - <<< "text snippet" |
|
0
score
|
While loop to pretty print system load (1, 5 & 15 minutes)$ while :; do date; awk '{printf "1 minute load: %.2f\n", $1; printf "5 minute load: %.2f\n", $2; printf "15 minute load: %.2f\n", $3}' /proc/loadavg; sleep 3; done |
|
0
score
|
Scan entire Git repos for dangerous Amazon Web Service IDs$ git ls-tree --full-tree -r --name-only HEAD | xargs egrep -w '[A-Z0-9]{20}' |
|
0
score
|
While loop to pretty print system load (1, 5 & 15 minutes)$ while [ 1 == 1 ]; do cat /proc/loadavg | awk '{printf "1 minute load: %.2f\n", $(NF-5)}' && cat /proc/loadavg |awk '{printf "5 minute load: %.2f\n", $(NF-3)}' && cat /proc/loadavg |awk '{printf "15 minute load: %.2f\n", $(NF-2)}'; sleep 3; date; done |
|
0
score
|
Organise image by portrait and landscape$ mkdir "portraits"; mkdir "landscapes"; for f in ./*.jpg; do WIDTH=$(identify -format "%w" "$f")> /dev/null; HEIGHT=$(identify -format "%h" "$f")> /dev/null; if [[ "$HEIGHT" > "$WIDTH" ]]; then mv "$f" portraits/ ; else mv "$f" landscapes/ ; fi; done |