Commands by igorfu

Commands by igorfu (10)

sorted by

Slow down IO heavy process

Some IO intensive process make the system unresponsive. This function periodically starts/stops a process, which hopefully releases some resources for other activities. This function is useful when ionice is not available Show Sample Output
This is sample output - yours may be different.
```
bash> cp /tmp/BIG /tmp/2 & slow $!
[1] 26494
[2] 26495
```
1

slow () { [ -n $1 ] && while ps -p $1 >/dev/null ; do kill -STOP $1; sleep 1; kill -CONT $1; sleep 1; done & }

igorfu · 2012-05-16 12:13:30 4
find and delete empty directories recursively
This is sample output - yours may be different.
0

perl -MFile::Find -e"finddepth(sub{rmdir},'.')"

igorfu · 2011-05-23 08:45:59 5
Delete empty directories

Recursively delete empty directories. Use with care.
This is sample output - yours may be different.
1

perl -MFile::Find -e"finddepth(sub{rmdir},'.')"

igorfu · 2011-05-23 08:45:34 8
Database size

Mysql command to list the disk usage of the database
This is sample output - yours may be different.
1

SELECT table_schema "Data Base Name", sum( data_length + index_length ) / 1024 / 1024 "Data Base Size in MB" FROM information_schema.TABLES GROUP BY table_schema ;

igorfu · 2011-05-23 08:42:38 5
list tomcat webapps

Tomcat webapps are often remote links
This is sample output - yours may be different.
0

ssh tomcat-server ls -l webapp-dir | grep -- '->' | awk ' { print $(NF-2) " " $(NF-1) " " $NF; }'

igorfu · 2011-05-23 08:38:28 4
Block an IP address

Thanks to http://www.cyberciti.biz/faq/how-do-i-block-an-ip-on-my-linux-server/
This is sample output - yours may be different.
-1

iptables -A INPUT -s 65.55.44.100 -j DROP

igorfu · 2011-05-23 08:32:47 5
Send an email using the mutt email client

It's very similar to this thread: http://www.commandlinefu.com/commands/view/4317/send-a-local-file-via-email mutt your@email_address.com -s "Message Subject Here" -a attachment.jpg </dev/null
This is sample output - yours may be different.
-1

M=bob@example.com; echo "Email message" | mutt -s "Email Subject" $M

igorfu · 2011-05-23 08:31:14 12
Restore accents in vi & others

French uses accents (???...) which may be badly displayed on computers with the wrong default character set. This command may help (sometimes)
This is sample output - yours may be different.
-1

LANG=fr_FR@euro

igorfu · 2011-05-23 08:27:22 4
Call remote web service

Use curl to invoke remote web service, where the file 'XML' is the soap payload
This is sample output - yours may be different.
-1

curl -D - -X POST -H 'Content-type: text/xml' -d @XML http://remote_server:8080/web-service/soap/WSName

igorfu · 2011-05-23 08:25:24 4
Install a remote RPM
This is sample output - yours may be different.
-1

sudo rpm -if "http://rpm_server/rpm_repo/this-app.rpm"

igorfu · 2011-05-23 08:19:15 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

reverse order of file

Make .bashrc function to backup the data you changed last houres

The original overwrites any previous backups, and only saves exactly the last hours worth, but not 1 hour + 1 minute. This version creates or appends files, and backs up everything since the last backup (using the backups timestamp as the reference), plus it uses TMPDIR if set.

post data with a http request

Find the package that installed a command

Copy recursivelly files of specific filetypes

Copying only wmv and mpg files recursively from to

Mnemonic for `nice` and `renice` command

This is just a phrase I use to help me remember which way is what when using nice (top, renice, etc.), and not a command, (unless you really want this in your .bash_history to help remind you.) I was using the command `man nice ` way too much just to look up which way is what. This saves 9 keystrokes every time I remember it. Make sure you downvote me if you think mnemonics sux. Otherwise I hope this helps someone else.

List all the files that have been deleted while they were still open.

If your customer deletes a file that is still in use by a process, that space does not get freed up (will not show up in df) until that process either closes the file on its own, or is killed.

Indent all the files in a project using emacs

use -iname \*[.ch] instead of -iname \*.c -o -iname \*.h

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

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 igorfu