All commands (13,268)
-
Uses the shell builtin `declare` with the '-f' flag to output only functions to grep out only the function names. You can use it as an alias or function like so: alias shfunctions="builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'" shfunctions () { builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'; } Show Sample Output
0builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)' -
0docker images | grep -v REPOSITORY | awk '{print $1}' | xargs -L1 docker pull
-
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale. Show Sample Output
0for i in {2018..2025}-{01..12}-13; do [[ $(date --date $i +"%u" | grep 5) != 5 ]] || echo "$i Friday the 13th"; done -
0ip route add default via 192.168.2.1 dev ens33
-
Alter the years in the first brace expansion to select your year range. Modify date format to your liking but leave " %w" at the end. Show Sample Output
0for i in {2018..2022}-{01..12}-13; do date --date $i +"%Y %B %w" | sed '/[^5]$/d; s/ 5*$//'; done -
Compare the content of the files in the current directory with files of the same name in the duplicate directory.
Pop Quiz: You have a duplicate of a directory with files of the same name that might differ. What do you do?You could use diff to compare the directories, but that's boring and it isn't as clever as find -print0 with xargs.Note: You must omit stderr redirect 2>/dev/null to see the list of missing files from DUPDIR, if any.Hint: Redirect stderr to a new file to produce a more readable list of files that are missing from DUPDIR.Warning: This doesn't tell you if DUPDIR contains files not found in the current directory so don't delete DUPDIR.Show Sample Output0find . -maxdepth 1 -mindepth 1 -print0 | xargs -0 -n 1 -I % cmp % /DUPDIR/% 2>/dev/null -
The dialog utility is used to create a basic level graphical user interface. We can use this in Shell script to create very useful programs. Show Sample Output
1dialog --textbox dock.sh 50 1000 -
Shorter version using --tag
0parallel --tag echo '$(du -s {} | awk "{print \$1}") / $(find {} | wc -l)' \| bc -l ::: * -
0sed 's/\"/\\\"/g' json_file | tr -d '\n' | tr -d '[[:blank:]]'
-
Creates one letter folders in the current directory and moves files with corresponding initial in the folder.
2for i in *; do I=`echo $i|cut -c 1|tr a-z A-Z`; if [ ! -d "$I" ]; then mkdir "$I"; fi; mv "$i" "$I"/"$i"; done -
Using to count all sentences in CoNLL data format
0echo $(( $(grep -c '^ $' file_name) / 2 )) -
2genRandomText() { local n=$1; while [ $((n--)) -gt 0 ]; do printf "\x$(printf %x $((RANDOM % 26 + 65)))" ; done ; echo ; }
-
I removed the dependency of the English language Show Sample Output
5for y in $(seq 1996 2018); do echo -n "$y -> "; for m in $(seq 1 12); do NDATE=$(date --date "$y-$m-13" +%w); if [ $NDATE -eq 5 ]; then PRINTME=$(date --date "$y-$m-13" +%B);echo -n "$PRINTME "; fi; done; echo; done -
Compactly display a bitcoin-cli fee estimate in satoshis/Byte, sat/B, date time stamp. Change the 6 to the desired number of confirmations. Display in btc/KB unit of measure:
printf %g "$(bccli estimatesmartfee 6 "ECONOMICAL" | jq .feerate)";printf " btc/KB estimated feerate for 6 confirmations\nMultiply by 100,000 to get sat/B\n";Two settings for estimate mode are "ECONOMICAL". "CONSERVATIVE" is the same as "UNSET" # jq is a json filter.sudo apt-get install jqShow Sample Output0printf %g "$(bitcoin-cli estimatesmartfee 6 "ECONOMICAL" | jq .feerate*100000)";printf " sat/B estimated feerate for 6 confirmations as of $(date +%c)\nDivide by 100,000 to get btc/KB\n" -
2for i in *.pdf; do mv "$i" CS749__"$i"; done
-
0watch -n 1 curl -XGET 'http://localhost:9200/_cluster/health?pretty=true'
-
Frustrated with the manual domain migration process AWS has, I unsuccessfully tried to install cli53, route53-transfer. I instead wrote this oneliner to ease the export (which is not supported via the AWS console ATM). The output can be easily pasted into the "Import Hosted Zone" dialog in Route53. SOA/NS records are excluded since they cannot be automatically imported. Show Sample Output
0echo -e "\$ORIGIN\tumccr.org.\n\$TTL\t1h\n" && aws route53 list-resource-record-sets --hosted-zone-id Z1EEXAMPLE9SF3 | jq -r '.ResourceRecordSets[] | [.Name, .Type, .ResourceRecords[0].Value] | join("\t")' - | grep -vE "NS|SOA" -
2sed -i 's/\r//g somefile.txt
-
I didn't come up with this myself, but I always add this to my .bash_aliases file. It's essentially the same idea as running "sudo !!" except it's much easier to type. (You can't just alias "sudo !!", it doesn't really work for reasons I don't understand.) "fc" is a shell built-in for editing and re-running previous commands. The -l flag tells it to display the line rather than edit it, and the -n command tells it to omit the line number. -1 tells it to print the previous line. For more detail:
help fc2alias please='sudo $(fc -ln -1)' -
Simply change the years listed in the first seq, and it will print out all the months in that span of years that have Friday the 13ths in them. Show Sample Output
1for y in $(seq 1996 2018); do echo -n "$y -> "; for m in $(seq 1 12); do NDATE=$(date --date "$y-$m-13" +%A); if [ $NDATE == 'Friday' ]; then PRINTME=$(date --date "$y-$m-13" +%B);echo -n "$PRINTME "; fi; done; echo; done -
0zgrep -i --color=always "string" files.gz | sort -k 2,3
-
0zgrep -i --color=always "search" file.gz | less -R
-
This function make it easy to compute X/Y as a percentage. The name "wpoxiy" is an acronym of "what percentage of X is Y" Show Sample Output
0function wpoxiy () { # What percentage of X is Y? Where percent/100 = X/Y => percent=100*X/Y # Example: wpoxiy 10 5 # 50.00% # Example: wpoxiy 30 10 # 33.33% echo $(bc <<< "scale=2; y=${1}; x=${2}; percent=x*100/y; percent")"%"; } -
Do you ever want to know which day of week was your birhday! Now you can check that with this command, just set your birh date at the beginning (My bday in the example) and the dates will be revealed. ;) Show Sample Output
3DAY=01; MONTH=07; YEAR=1979; CURRENT_YEAR=$(date +%Y); for i in $(seq $YEAR $CURRENT_YEAR); do echo -n "$i -> "; date --date "$i-$MONTH-$DAY" +%A; done -
Run netstat as root (via sudo) to get the ID of the process listening on the desired socket. Use awk to 1) match the entry that is the listening socket, 2) matching the exact port (bounded by leading colon and end of column), 3) remove the trailing slash and process name from the last column, and finally 4) use the system(…) command to call kill to terminate the process. Two direct commands, netstat & awk, and one forked call to kill. This does kill the specific port instead of any port that starts with 50. I consider this to be safer.
3sudo netstat -plnt | awk '($4 ~ /:50$/){sub(/\/.*/, "", $7); system("sudo kill " $7)}' - 1 2 3 > Last ›
What's this?
commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
Check These Out
Stay in the loop…
- Follow the Tweets.
-
Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10 - Subscribe to the feeds.
-
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
Subscribe to the feed for:
- » all commands
- » commands with 3 up-votes (commandlinefu3)
- » commands with 10 up-votes (commandlinefu10)