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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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list block devices

Shows all block devices in a tree with descruptions of what they are.

list block devices

Shows all block devices in a tree with descruptions of what they are.

clear current line

Sort files in folders alphabetically

Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Email a file to yourself

This works on Solaris 10.

recursive search and replace old with new string, inside files

xargs deals badly with special characters (such as space, ' and "). To see the problem try this: touch important_file touch 'not important_file' ls not* | xargs rm Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

Find files in multiple TAR files

A quick find command to identify all TAR files in a given path, extract a list of files contained within the tar, then search for a given string in the filelist. Returns to the user as a list of TAR files found (enclosed in []) followed by any matching files that exist in that archive. TAR can easily be swapped for JAR if required.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Print every Nth line

Sometimes commands give you too much feedback. Perhaps 1/100th might be enough. If so, every() is for you. $ my_verbose_command | every 100 will print every 100th line of output. Specifically, it will print lines 100, 200, 300, etc If you use a negative argument it will print the *first* of a block, $ my_verbose_command | every -100 It will print lines 1, 101, 201, 301, etc The function wraps up this useful sed snippet: $ ... | sed -n '0~100p' don't print anything by default $ sed -n starting at line 0, then every hundred lines ( ~100 ) print. $ '0~100p' There's also some bash magic to test if the number is negative: we want character 0, length 1, of variable N. $ ${N:0:1} If it *is* negative, strip off the first character ${N:1} is character 1 onwards (second actual character).

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