Commands by ruedu

Commands by ruedu (4)

sorted by

Let's say you have a web site

So you have a web site and you've plastered your significant other's name all over it. But you broke up with them and have some new love in your life. How do you find all those instances of their name and replace them?
This is sample output - yours may be different.
-1

for I in `find . -name "*.php"`; do sed -i "s/old name/new name/g" $I; done

ruedu · 2009-02-16 17:09:09 2
Push your present working directory to a stack that you can pop later

If are a Bash user and you are in a directory and need to go else where for a while but don't want to lose where you were, use pushd instead of cd. cd /home/complicated/path/.I/dont/want/to/forget pushd /tmp cd thing/in/tmp popd (returns you to /home/complicated/path/.I/dont/want/to/forget)
This is sample output - yours may be different.
102

pushd /tmp

ruedu · 2009-02-16 16:52:59 8
Backup all MySQL Databases to individual files

Backups all MySQL databases to individual files. Can be put into a script that grabs current date so you have per day backups.
This is sample output - yours may be different.
9

for I in `echo "show databases;" | mysql | grep -v Database`; do mysqldump $I > "$I.sql"; done

ruedu · 2009-02-16 16:41:05 1
Get your default route

This gets you your default route programatically, useful for scripts
This is sample output - yours may be different.
1

ip route | grep default | awk '{print $3}'

ruedu · 2009-02-16 16:29:03 1

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

Touch a file using a timestamp embedded in the file name.

tstouch takes two arguments: a filename containing a timestamp, and an extended regular expression with the parenthesized section matching a timestamp of the form YYYYMMDDhhmm or YYYYMMDDhhmm.ss. It then touches the file with that timestamp.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Edit a script that's somewhere in your path.

Often I need to edit a bash or perl script I've written. I know it's in my path but I don't feel like typing the whole path (or I don't remember the path).

Download a numbered sequence of files

list files recursively by size

check open ports without netstat or lsof

get diskusage of files modified during the last n days

get diskusage of files (in this case logfiles in /var/log) modified during the last n days: $ sudo find /var/log/ -mtime -n -type f | xargs du -ch n -> last modified n*24 hours ago Numeric arguments can be specified as +n for greater than n, -n for less than n, n for exactly n. => so 7*24 hours (about 7 days) is -7 $ sudo find /var/log/ -mtime -7 -type f | xargs du -ch | tail -n1

See system users

split a multi-page PDF into separate files

Simple alternative to the previous submitted one

Rename files in batch

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 ruedu