Commands by nottings

Commands by nottings (13)

sorted by

generate a randome 10 character password
This is sample output - yours may be different.
7

tr -dc A-Za-z0-9_ < /dev/urandom | head -c 10 | xargs

nottings · 2012-10-17 14:04:14 10
stop man page content from disappearing on exit

stop man page content from disappearing on exit echo "export LESS='FiX'" >> ~/.bashrc man bash 'q'uit out of man page content will stay on screen Show Sample Output
This is sample output - yours may be different.
```
man bash
'q'uit out of man page
content will stay on screen
```
7

echo "export LESS='FiX'" >> ~/.bashrc

nottings · 2010-11-08 21:58:25 8
Show exit status of all portions of a piped command eg. ls |this_doesn't_exist |wc
This is sample output - yours may be different.
5

echo ${PIPESTATUS[@]}

nottings · 2010-11-01 21:46:58 5
direct a single stream of input (ls) to multiple readers (grep & wc) without using temporary files
This is sample output - yours may be different.
8

ls |tee >(grep xxx |wc >xxx.count) >(grep yyy |wc >yyy.count) |grep zzz |wc >zzz.count

nottings · 2010-10-25 17:49:14 4
display date of last time a process was started in `date` format

STARTED Mon Oct 18 04:02:01 2010 Show Sample Output
This is sample output - yours may be different.
```
STARTED
Mon Oct 18 04:02:01 2010
```
5

ps -o lstart <pid>

nottings · 2010-10-18 17:09:02 5

bash -x ./post_to_commandlinefu.sh

nottings · 2009-02-25 19:10:21 54

skip broken piece of a loop but not exit the loop entirely

useful for loops like for i in $(cat list_of_servers); do ssh -q $i hostname; done if there is an unreachable server, you can just press ctrl + \ to skip that server and continue on with the loop
This is sample output - yours may be different.
7

ctrl + \

nottings · 2009-02-25 18:52:57 8
connect to X login screen via vnc

the $15 may change for you depending on your distro, etc...
This is sample output - yours may be different.
4

x11vnc -display :0 -auth $(ps -ef|awk '/xauth/ {print $15}'|head -1) -forever -bg &

nottings · 2009-02-19 18:55:54 5
read a file line by line and perform some operation on each line

see sample output Show Sample Output
This is sample output - yours may be different.
```
snottin@drifter /tmp $ cat > somefile.txt
line 1
line 2
line 3
snottin@drifter /tmp $ while read line; do echo "$(date),$(hostname),$line"; done < somefile.txt
Thu Feb 19 12:47:57 CST 2009,drifter,line 1
Thu Feb 19 12:47:57 CST 2009,drifter,line 2
Thu Feb 19 12:47:57 CST 2009,drifter,line 3
```
2

while read line; do echo "$(date),$(hostname),$line"; done < somefile.txt

nottings · 2009-02-19 18:48:12 11
use vi key bindings at the command line
This is sample output - yours may be different.
5

set -o vi

nottings · 2009-02-19 18:40:44 5
display contents of a file w/o any comments or blank lines
This is sample output - yours may be different.
4

egrep '^[^#]' some_file

nottings · 2009-02-19 17:35:52 15
open a seperate konsole tab and ssh to each of N servers (konsole 4.2+)

creates a new tab for each of N servers in listofservers.txt and ssh's to said servers then, try the "send to all sessions" feature of konsole to do the same work on all servers at the same time. BIG time saver, but be careful!
This is sample output - yours may be different.
4

for i in $(cat listofservers.txt); do konsole --new-tab -e ssh $i; done

nottings · 2009-02-19 16:32:36 8
Convert file type to unix utf-8

converts encoding of a file to unix utf-8 useful for data files that contain what would be usable ascii text but are encoded as mpeg or some other encoding that prevents you from doing common manipulations like 'sed' Show Sample Output
This is sample output - yours may be different.
```
[root@gaslight WAP_EMI_scans]# file datafile1.csv
datafile1.csv: MPEG ADTS, layer I, v1, 160 kBits, 32 kHz, Stereo
[root@gaslight WAP_EMI_scans]# ex datafile1.csv "+set ff=unix fileencoding=utf-8" "+x"
[root@gaslight WAP_EMI_scans]# file datafile1.csv
datafile1.csv: Unicode text, UTF-8
```
5

ex some_file "+set ff=unix fileencoding=utf-8" "+x"

nottings · 2009-02-19 16:23:21 7

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.

Share Your Commands

Check These Out

Show available conversions

aliases on each line. i.e. txt2html: $recode ..HTML file.html txt to Base64: $recode ../b64 file.b64 and so on.

Perl Command Line Interpreter

Read, Evaluate, Print, Loop - REPL

shorten url using curl, sed and is.gd

Just create a function in your .bashrc like this shorturl() { curl -s -d URL="$1" http://is.gd/create.php | sed '/Your new shortened/!d;s/.*value="$[^"]*$".*/\1/' }

Recursive find and replace file extension / suffix (mass rename files)

Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

Quickly ping range of IP adresses and return only those that are online

Echo the latest commands from commandlinefu on the console

Self-referential use of wget.

Edit 2 or more files in vim using vim -d

Is this not the same

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Finding files with different extensions

This is the way how you can find header and cpp files in the same time.

Merge files, joining each line in one line

Merge files, joining line by line horizontally. Very useful when you have a lot of files where each line represents an info about an event and you want to join them into a single file where each line has all the info about the same event See the example for a better understanding

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)
» commands by nottings