All commands (14,187)
-
I wanted to keep a backup of my company database server on my local homeserver. After I found maatkit to sync databases, everything except security seemed fine. SSH takes care of that part.
7ssh -f -L3307:127.0.0.1:3306 -N -t -x user@host sleep 600 ; mk-table-sync --execute --verbose u=root,p=xxx,h=127.0.0.1,P=3307 u=root,p=xxx,h=localhost -
shows also time if its the same year or shows year if installed before actual year and also works if /etc is a link (mac os) Show Sample Output
5ls -lct /etc/ | tail -1 | awk '{print $6, $7, $8}' -
Have wc work on each file then add up the total with awk; get a 43% speed increase on RHEL over using "-exec cat|wc -l" and a 67% increase on my Ubuntu laptop (this is with 10MB of data in 767 files).
-1find . -type f -name '*.c' -exec wc -l {} \; | awk '{sum+=$1} END {print sum}' -
One pipe less. Show Sample Output
1bc -l <<< "x=2; p=0.5; e(l(x)*p)" -
Every seconds do Show Sample Output
-1watch -n <seconds> <command> -
0/sbin/badblocks -v /dev/fd0 1440
-
-2tcpdump -n -v tcp or udp or icmp and not port 22
-
Based on the MrMerry one, just add some visuals to differentiate files and directories
3du -a --max-depth=1 | sort -n | cut -d/ -f2 | sed '$d' | while read i; do if [ -f $i ]; then du -h "$i"; else echo "$(du -h --max-depth=0 "$i")/"; fi; done -
An NCurses version of the famous old 'du' unix command
20ncdu -
Based on the MrMerry one, just add some visuals and sort directory and files
2find . -maxdepth 1 -type d|xargs du -a --max-depth=0|sort -rn|cut -d/ -f2|sed '1d'|while read i;do echo "$(du -h --max-depth=0 "$i")/";done;find . -maxdepth 1 -type f|xargs du -a|sort -rn|cut -d/ -f2|sed '$d'|while read i;do du -h "$i";done -
To highlight the difference between screen updates
0watch -d 'ls -l' -
If you need to keep an eye on a command whose output is changing, use the watch command. For example, to keep an eye on your load average
1watch 'cat /proc/loadavg' -
0ioreg -l -p IODeviceTree | grep -o EFI[0-9]. && system_profiler SPSoftwareDataType |grep 64
-
If you launch gnome-terminal manually, you can start with three open tabs
2gnome-terminal --tab --tab --tab -
checkfor: have the shell check anything you're waiting for. 'while : ; do' is an infinite loop '$*' executes the command passed in 'sleep 5' - change for your tastes, sleep for 5 seconds bash, ksh, likely sh, maybe zsh Ctrl-c to break the loop Show Sample Output
1function checkfor () { while :; do $*; sleep 5; done; } -
For example: check the APT security keys to make sure the Google digital signature was imported correctly Show Sample Output
0apt-key list -
4apt-cache stats
-
You can view the man pages from section five by passing the section number as an argument to the man command Show Sample Output
1man 5 crontab -
fcd : file change directory A bash function that takes a fully qualified file path and cd's into the directory where it lives. Useful on the commadline when you have a file name in a variable and you'd like to cd to the directory to RCS check it in or look at other files associated with it. Will run on any ksh, bash, likely sh, maybe zsh. Show Sample Output
1function fcd () { [ -f $1 ] && { cd $(dirname $1); } || { cd $1 ; } pwd } -
Make sure that find does not touch anything other than regular files, and handles non-standard characters in filenames while passing to xargs.
-1find . -type f -exec grep -qi 'foo' {} \; -print0 | xargs -0 vim -
Sends both stdout and stderr to the pipe which captures the data in the file 'out.test' and sends to stdout of tee (likely /dev/tty unless redirected). Works on Bourne, Korn and Bash shells.
4bash -x test.sh 2>&1 | tee out.test -
-8echo $((3.0/5.0))
-
needs no GNU tools, as far as I see it
-1find . -exec grep foobar /dev/null {} \; | awk -F: '{print $1}' | xargs vi -
saves one command. Needs GNU grep though :-(
0grep -ir 'foo' * | awk -F '{print $1}' | xargs vim -
The grep switches eliminate the need for awk and sed. Modifying vim with -p will show all files in separate tabs, -o in separate vim windows. Just wish it didn't hose my terminal once I exit vim!!
3grep -Hrli 'foo' * | xargs vim - ‹ First < 453 454 455 456 457 > 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)