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Print all fields in a file/output from field N to the end of the line
This is sample output - yours may be different.
2

cut -f N- file.dat

sklm · 2009-08-31 23:08:18 4
Find files that were modified by a given command

Traces the system calls of a program. See http://linuxhelp.blogspot.com/2006/05/strace-very-powerful-troubleshooting.html for more information.
This is sample output - yours may be different.
3

strace <name of the program>

eitland · 2009-08-31 20:42:50 10
Print all fields in a file/output from field N to the end of the line

This command will print all fields from the given input to the end of each line, starting with the Nth field.
This is sample output - yours may be different.
0

awk '{print substr($0, index($0,$N))}'

mstoecker · 2009-08-31 19:47:10 6
Find files that were modified by a given command

This has helped me numerous times trying to find either log files or tmp files that get created after execution of a command. And really eye opening as to how active a given process really is. Play around with -anewer, -cnewer & -newerXY Show Sample Output
This is sample output - yours may be different.
```
[root@localhost ~]# touch /tmp/service
[root@localhost ~]# service cups restart
Stopping cups:                                             [  OK  ]
Starting cups:                                             [  OK  ]
[root@localhost ~]# find /var -newer /tmp/service
/var/cache/cups/job.cache
/var/lock/subsys
/var/lock/subsys/cups
/var/log/audit/audit.log
/var/run
/var/run/cupsd.pid
/var/run/cups
/var/run/cups/cups.sock
/var/run/cups/certs
/var/run/cups/certs/0
[root@localhost ~]#
```
22

touch /tmp/file ; $EXECUTECOMMAND ; find /path -newer /tmp/file

matthewdavis · 2009-08-31 18:47:19 11

xargs can be used in this manner to download multiple files at a time, and xargs will in this case run 10 processes at a time and initiate a new one when the number running falls below 10. Show Sample Output

wget -nv http://en.wikipedia.org/wiki/Linux -O- | egrep -o "http://[^[:space:]]*.jpg" | xargs -P 10 -r -n 1 wget -nv

grokskookum · 2009-08-31 18:37:33 55

How to run a command on a list of remote servers read from a file

dsh - Distributed shell, or dancer?s shell ;-) you can put your servers into /etc/dsh/machines.list than you don't have to serperate them by commata or group them in different files and only run commands for this groups dsh -M -c -a -- "apt-get update" Show Sample Output
This is sample output - yours may be different.
```
micha@lucie:~$ dsh -M -c -f test -- "hostname -f"
root@abc.de: abc.de
root@xyz.de: xyz
```
4

dsh -M -c -f servers -- "command HERE"

foob4r · 2009-08-31 12:08:38 3
See the order for DNS resolution on your Mac
This is sample output - yours may be different.
-1

scutil --dns

romant · 2009-08-31 10:34:08 3
Who needs pipes?

or: C
This is sample output - yours may be different.
6

B <<< $(A)

asg0451 · 2009-08-30 20:20:18 11
Intall not signed packeges with yum

Same as: 1 rpm -ivh package.rpm 2 yum localinstall package.rpm 3 Edit /etc/yum.conf or repository.repo and change the value of gpgcheck from 1 to 0 (!dangerous)
This is sample output - yours may be different.
-1

yum --nogpgcheck install "examplePackage"

iDen · 2009-08-30 18:18:30 3
Top 10 requestors by IP address from Apache/NCSA Logs
This is sample output - yours may be different.
3

awk '{print $1}' /var/log/httpd/access_log | sort | uniq -c | sort -rnk1 | head -n 10

flip387 · 2009-08-30 15:32:26 3
Get list of all Apache Virtual Host and which is default for each IP address

Show Sample Output
This is sample output - yours may be different.
```
VirtualHost configuration:
1.2.3.4:80     is a NameVirtualHost
         default server domain.com (/etc/httpd/conf.d/domain_virhost.conf:1)
         port 80 namevhost domain.com (/etc/httpd/conf.d/domain_virhost.conf:1)
Syntax OK
```
-1

httpd -S

flip387 · 2009-08-30 15:28:39 4
Run a cron job every 15 mins past the hour

Instead of using: 0,15,30,45 * * * * /path/to/command
This is sample output - yours may be different.
-9

*/15 * * * * /path/to/command

sharfah · 2009-08-30 14:53:08 3
show all key and mouse events

for mousevents, move the mouse over the window and click/move etc. usefull for getting mouseKeys, or keyKeys. also usefull for checking if X gets those mouse-events.
This is sample output - yours may be different.
3

xev

linuxswords · 2009-08-30 14:41:16 10
get all pdf and zips from a website using wget

If the site uses https, use: wget --reject html,htm --accept pdf,zip -rl1 --no-check-certificate https-url
This is sample output - yours may be different.
17

wget --reject html,htm --accept pdf,zip -rl1 url

linuxswords · 2009-08-30 14:05:09 6
Search gpg keys from commandline
This is sample output - yours may be different.
1

gpg --search-keys

linuxswords · 2009-08-30 13:52:29 3
convert mp3 into mb4 (audiobook format)

to convert a whole directory, put all mp3 files in a for loop for i in $(ls *mp3); do mpg123 -s $i | faac -b 80 -P -X -w -o ${i%mp3}m4b -; done
This is sample output - yours may be different.
1

mpg123 -s input.mp3 | faac -b 80 -P -X -w -o output.m4b -

linuxswords · 2009-08-30 13:15:37 3
rkhunter (Rootkit Hunter) is a Unix-based tool that scans for rootkits, backdoors and possible local exploits. rkhunter is a shell script which carries out various checks on the local system to try and detect known rootkits and malware. It also performs c

rkhunter (Rootkit Hunter) is a Unix-based tool that scans for rootkits, backdoors and possible local exploits. rkhunter is a shell script which carries out various checks on the local system to try and detect known rootkits and malware. It also performs checks to see if commands have been modified, if the system startup files have been modified, and various checks on the network interfaces, including checks for listening applications.
This is sample output - yours may be different.
-2

rkhunter --check

unixbhaskar · 2009-08-30 12:53:33 7
Check the backdoors and security.chkrootkit is a tool to locally check for signs of a rootkit.

chkrootkit is a tool to locally check for signs of a rootkit,Get it from the website http://www.chkrootkit.org
This is sample output - yours may be different.
-1

chkrootkit -x | less

unixbhaskar · 2009-08-30 12:47:08 3
Creating shortened URLs from the command line

Show Sample Output
This is sample output - yours may be different.
```
$ curl -s http://tinyurl.com/create.php?url=http://www.commandlinefu.com/ | sed -n 's/.*$http:\/\/tinyurl.com\/[a-z0-9][a-z0-9]*$.*/\1/p'
http://tinyurl.com/d52z2c
```
1

curl -s http://tinyurl.com/create.php?url=http://<website.url>/ | sed -n 's/.*$http:\/\/tinyurl.com\/[a-z0-9][a-z0-9]*$.*/\1/p' | uniq

amaymon · 2009-08-30 07:55:48 8
A snooze button for xmms2 alarm clock

you can also run "xmms2 pause & at now +5min
This is sample output - yours may be different.
2

xmms2 pause && echo "xmms2 play" | at now +5min

Vrekk · 2009-08-30 04:35:10 3
Show Mac OS X version information
This is sample output - yours may be different.
2

sw_vers

theoj · 2009-08-29 21:27:18 3
check the fucking weather

grab the weather, with a little expletive fun. replace the 48104 with a US zipcode, or the name of your city (such as ZIP="oslo"), unless you want to know what the weather is like for me (and that's fine too) Show Sample Output
This is sample output - yours may be different.
```
70 - ITS FUCKING NICE
```
1

ZIP=48104; curl http://thefuckingweather.com/?zipcode=$ZIP 2>/dev/null|grep -A1 'div class="large"'|tr '\n' ' '|sed 's/^.*"large" >$..$/\1/;s/&d.* <br \/>/ - /;s/<br \/>//;s/<\/div.*$//'

sleepynate · 2009-08-29 19:33:35 102

To find how Apache has been compiled from commandline

To get information at your fingertips about Apache compilation. Show Sample Output

-1

httpd2 -V

unixbhaskar · 2009-08-29 13:04:37 3

Another way to see the network interfaces

Like many other thing in Linux ,you can see the same thing in different way. Show Sample Output

ip addr show

unixbhaskar · 2009-08-29 12:52:02 3

Get the information about the Apache loaded modules from command line

This is a handy way to find which modules are loaded with Apache web server. Show Sample Output

-1

httpd2 -M

unixbhaskar · 2009-08-29 12:46:10 3

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Runs a command without hangups.

puts command in background and sends its output to nohup.out file it will not die if you log out fromyour shell session ;-)

Press ctrl+r in a bash shell and type a few letters of a previous command

In the sample output, I pressed ctrl+r and typed the letters las. I can't imagine how much typing this has saved me.

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

Tail postfix current maillog and grep for "criteria"

Tail curren postfix maillog.

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"

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

Shows cpu load in percent

This version is precise and requires one second to collect statistics. Check sample output for a more generic version and also a remote computer invocation variant. It doesn't work with the busybox version of the 'top' command but can be adjusted

Apply substitution only on the line following a marker

I've been auto-generating some complex GnuPlots; with multiplots the first plot of each group needs to be a 'plot' whereas the others need to be 'replots' to allow overplotting/autoscaling/etc to work properly. This is used to replace only the first instance of 'replot'.

Find and copy scattered mp3 files into one directory

No problem with word splitting. That should works on many Unix likes.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

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