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Create new repo in Cobbler for CentOS 5.3 updates

Add a repo to cobbler. To download all the repository contents the command is: cobbler reposync
This is sample output - yours may be different.
-1

cobbler repo add --name=CentOS-5.3-i386-updates --mirror=http://mirror3.mirror.garr.it/mirrors/CentOS/5.3/updates/i386/

w00binda · 2009-04-27 10:18:45 5
Laminate files line by line

Lam is a command available on Bsd (I've tested it on OpenBSD).Is useful for laminate a file line by line. The -f option set the field width ( -f min.max ). Show Sample Output
This is sample output - yours may be different.
```
setg
 
# ht
#
html
 
# ma
#
manp
 
# sa
# Th
#
samp
 
# re
#
read
```
0

lam -f 1.4 myfile

servermanaged · 2009-04-26 19:31:22 12
download a specific file

download a specific file with -f to not display errors and -O to write output to a file named as the remote file. Show Sample Output
This is sample output - yours may be different.
```
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
 11 1621M   11  192M    0     0  1003k      0  0:27:34  0:03:16  0:24:18 1119k
```
-7

curl -f -O http://pcbsd.fastbull.org/7.0.2/i386/PCBSD7.0.2-x86-DVD.iso

battavia · 2009-04-26 07:23:31 13
Connect to all running screen instances

There was another line that was dependent on having un-named screen sessions. This just wouldn't do. This one works no matter what the name is. A possible improvement would be removing the perl dependence, but that doesn't effect me.
This is sample output - yours may be different.
2

for i in `screen -ls | perl -ne'if(/^\s+\d+\.([^\s]+)/){print $1, " "}'`; do gnome-terminal -e "screen -x $i"; done

hank · 2009-04-25 22:39:24 7
Convert Raw pictures to jpg
This is sample output - yours may be different.
0

for img in $( ls *.CR2 ); do convert $img $img.jpg; done

bass000 · 2009-04-25 19:11:52 7
Get a summary of network devices in the system

Basically an improvement on an earlier ethtool command line. Show Sample Output
This is sample output - yours may be different.
```
# eth0
	Speed: Unknown! (65535)
	Link detected: no
# eth1
	Speed: 100Mb/s
	Link detected: yes
# lo
	Link detected: yes
# pan0
	Link detected: yes
# tap1
	Speed: 10Mb/s
	Link detected: no
```
0

for i in /sys/class/net/*; do e=`basename $i`; echo "# $e"; sudo ethtool $e | grep -E "Link|Speed" ; done

hank · 2009-04-25 14:32:08 10
Watch Network Service Activity in Real-time
This is sample output - yours may be different.
101

lsof -i

hank · 2009-04-25 14:24:04 24
Create directory named after current date

Not a discovery but a useful one nontheless. In the above example date format is 'yyyymmdd'. For other possible formats see 'man date'. This command can be also very convenient when aliased to some meaningful name: alias mkdd='mkdir $(date +%Y%m%d)'
This is sample output - yours may be different.
11

mkdir $(date +%Y%m%d)

thebodzio · 2009-04-25 14:16:45 13
Propagate a directory to another and create symlink to content

Lndir create from source directory to destination directory a full symlink tree of all contents of source directory, really useful for propagate changes from a directory to another.
This is sample output - yours may be different.
4

lndir sourcedir destdir

servermanaged · 2009-04-24 18:30:29 8
Display lines with a given string

Look search for lines in a file that beginning with a given string. Same as $ grep ^n /etc/passwd Show Sample Output
This is sample output - yours may be different.
```
# look mysql /etc/group
mysql:x:125:
```
-2

look mysql /etc/group

servermanaged · 2009-04-24 18:20:20 6
Use md5 to generate a pretty hard to crack password

You can also use sha1sum and variants for longer passwords Show Sample Output
This is sample output - yours may be different.
```
280e25ade5d92394063ca7ae071d9f16
```
-5

echo "A great password" | md5sum

ubersoldat · 2009-04-24 14:32:56 8
set open firmware password command mode to require password to make changes
This is sample output - yours may be different.
-1

/usr/local/bin/OFPW -mode 1

tncook · 2009-04-24 13:09:17 4
Sets OpenFirmware pasword on a mac
This is sample output - yours may be different.
-1

/usr/local/bin/OFPW -pass thepassword

tncook · 2009-04-24 13:08:31 5
Show all detected mountable Drives/Partitions/BlockDevices

Yields entries in the form of "/dev/hda1" etc. Use this if you are on a new system and don't know how the storage hardware (ide, sata, scsi, usb - with ever changing descriptors) is connected and which partitions are available. Far better than using "fdisk -l" on guessed device descriptors. Show Sample Output
This is sample output - yours may be different.
```
disk:
 /dev/sda    USB-Stick
 /dev/cloop0 Disk
 /dev/hda    HARDDISK
partition:
 /dev/sda1   Partition 
 /dev/hda1   Partition
 /dev/hda2   Partition
cdrom:
 /dev/hdc    CD-ROM
floppy:
 /dev/fd0    Floppy Disk
```
13

hwinfo --block --short

Schneckentreiber · 2009-04-24 11:13:31 10
Change password in list of xml files with for and sed
This is sample output - yours may be different.
-6

for i in `ls *xml`; do sed -e 's,oldpassword,newpassword,g' $i > $i.2 && mv -f $i.2 $i ; done

irraz · 2009-04-24 08:53:40 9
Given process ID print its environment variables
This is sample output - yours may be different.
16

sed 's/\o0/\n/g' /proc/INSERT_PID_HERE/environ

unixmonkey3402 · 2009-04-23 22:58:57 8
Install a library to a remote repository
This is sample output - yours may be different.
0

mvn deploy:deploy-file -DgroupId=groupId -DartifactId=artifactId -Dversion=1.0 -Dpackaging=jar -Dfile=pathtolib -DrepositoryId=repository -Durl=url

agasea · 2009-04-23 18:13:08 4
compare two Microsoft Word documents

http://meld.sourceforge.net/ http://www.winfield.demon.nl/
This is sample output - yours may be different.
2

meld <(antiword microsoft_word_a.doc) <(antiword microsoft_word_b.doc)

peter_shook · 2009-04-23 15:14:32 8
Recursively change permissions on files, leave directories alone.
This is sample output - yours may be different.
34

find ./ -type f -exec chmod 644 {} \;

ethanmiller · 2009-04-22 21:14:36 22
compile openvm-tools

compile and install openvm-tools module in debian lenny
This is sample output - yours may be different.
-4

m-a a-i open-vm

m03hr3 · 2009-04-22 20:08:00 5
Browse shared folder when you're the only Linux user

Under Ubuntu smbclient is part of the samba package. With the version I use (3.0.28a) cd-ing into folders with spaces in the name is a drag. You have to put the folder name in quotes: smb: \Shared\> cd "Marketing and PR"
This is sample output - yours may be different.
3

smbclient -U userbob //10.1.1.75/Shared

ethanmiller · 2009-04-22 19:58:51 11
eth-tool summary of eth# devices

Give the Speed and Link status of eth# 0-3. This is sort of what mii-tool does, but eth-tool is better, yet lacks device discovery. Show Sample Output
This is sample output - yours may be different.
```
eth0
        Speed: Unknown! (65535)
        Link detected: no
eth1
        Speed: Unknown! (65535)
        Link detected: no
eth2
        Speed: 1000Mb/s
        Link detected: yes
eth3
        Speed: Unknown! (65535)
        Link detected: no
```
6

for M in 0 1 2 3 ; do echo eth$M ;/sbin/ethtool eth$M | grep -E "Link|Speed" ; done

Wubby · 2009-04-22 19:32:41 9
a short counter

Maybe you know shorter ? Show Sample Output
This is sample output - yours may be different.
```
1
     2
     3
     4
```
18

yes '' | cat -n

flux · 2009-04-22 17:58:46 15
Refresh profile file

If you edit your .profile you need to refresh it for changes to take place. Simple way to refresh is logout and login. This command is the quickest way to do it. If you're deleting some variables, they would not get nulled with this command but just removed.
This is sample output - yours may be different.
-5

. ~/.profile

ruchi · 2009-04-22 16:56:12 16
Get thread count for process on Solaris
This is sample output - yours may be different.
0

ps -L -p <pid> | wc -l

adamm9 · 2009-04-22 15:05:26 5
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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.

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Reset hosed terminal,

stty sane resets the tty to basic usable function. The ^J is a newline -- sometimes CR/LF interpretation is broken so use the ^J explicitly.

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.

Search for a word in less

Although less behaves more or less like vim in certain aspects, the vim regex for word boundaries (\< and \>) do not work in less. Instead, use \b to denote a word boundary. Therefore, if you want to search for, say, the word "exit", but do not want to search for exiting, exits, etc., then surround "exit" with \b. This is useful if you need to search for specific occurrences of a keyword or command. \b can also be used at just the beginning and end, if needed.

diff files while disregarding indentation and trailing white space

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Cleanly manage tempfiles in scripts

Cleanly create tempfiles using mktemp and remove them using traps instead of removing them in the end of the script. This way, you make sure the tempfiles are removed properly even if the script is killed or interrupted. For a user script in KDE4, you can set TMPROOT using : $ TMPROOT=$(kde4-config --path tmp)

increase recursively the modification time for a list of files

Increase the modification date for the files selected with the find command.

Record camera's output to a avi file

video.avi is the resulting file. Press Ctrl+c to stop the recording. You can change the OVC option to another to record into a different format.

See system users

clone directory structure

dir1 and all its subdirs and subdirs of subdirs ... but *no files* will be copied to dir2 (not even symbolic links of files will be made). To preserve ownerships & permissions: $ cp -Rps dir1 dir2 Yes, you can do it with $ rsync -a --include '*/' --exclude '*' /path/to/source /path/to/dest too, but I didn't test if this can handle attributes correctly (experiment rsync command yourself with --dry-run switch to avoid harming your file system) You must be in the parent directory of dir1 while executing this command (place dir2 where you will), else soft links of files in dir2 will be made. I couldn't find how to avoid this "limitation" (yet). Playing with recursive unlink command loop maybe? PS. Bash will complain, but the job will be done.

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