Commands by servermanaged

Commands by servermanaged (56)

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Nicely display mem usage with ps

Nicely display mem usage with ps. Show Sample Output

ps -o comm,%mem,args -u www-data

servermanaged · 2010-05-22 15:13:25 4

Create a directory and go inside it

_ expands to the last argument of the last command that was executed
This is sample output - yours may be different.
1

mkdir dir; cd $_

servermanaged · 2010-01-13 11:56:36 9

Monitor memory usage

Monitor with watch command and vmstat, memory usage Show Sample Output

watch vmstat -sSM

servermanaged · 2009-12-04 22:35:45 7

Run command in an ftp session

By putting ! in front of a command, we are able to run it from an ftp session. Show Sample Output
This is sample output - yours may be different.
```
ftp> !w
10:38PM  up 32 mins, 2 users, load averages: 0.45, 0.16, 0.06
USER             TTY      FROM              LOGIN@  IDLE WHAT
root             v0       -                10:06PM     2 tar -xpjf - (bsdtar)
root             pts/0    192.168.1.104    10:07PM     - w   
```
1

ftp>!w

servermanaged · 2009-11-26 21:41:28 5
Quick notepad

Quick write some notes to a file with cat. Ctrl+C when you have finish.
This is sample output - yours may be different.
3

cat > list -

servermanaged · 2009-10-29 20:20:11 28
Monitor bandwidth by pid

Nethogs is a useful tool for monitor bandwidth consumption by pid. Tested on Debian an CentOs
This is sample output - yours may be different.
23

nethogs -p eth0

servermanaged · 2009-10-24 19:43:31 9
Localize provenance of current established connections

Sample command to obtain a list of geographic localization for established connections, extracted from netstat. Need geoiplookup command ( part of geoip package under CentOS) Show Sample Output
This is sample output - yours may be different.
```
GeoIP Country Edition: ES, Spain
GeoIP Country Edition: IT, Italy
GeoIP Country Edition: IT, Italy
GeoIP Country Edition: SE, Sweden
GeoIP Country Edition: NL, Netherlands
GeoIP Country Edition: ES, Spain
GeoIP Country Edition: SE, Sweden
```
3

for i in $(netstat --inet -n|grep ESTA|awk '{print $5}'|cut -d: -f1);do geoiplookup $i;done

servermanaged · 2009-10-18 20:41:47 5
Insert a comment on command line for reminder

Comments can be used directly on the command line so I can save in the history a brief description of what command does.
This is sample output - yours may be different.
5

ls -alh #mycomment

servermanaged · 2009-10-06 13:55:06 8
Laminate a file

Consider this file : laminate this file with awk hello to commandlinefu I can use awk substring to laminate words : lamin this file with hello comma Similar to http://www.commandlinefu.com/commands/view/2000/laminate-files-line-by-line Show Sample Output
This is sample output - yours may be different.
```
lamin
this
file
with 
hello
comma
```
-2

awk '{print(substr($0,1,5))}' file

servermanaged · 2009-10-05 18:58:49 5
Benchmark report generator

Nicely display in html format a detailed report of the machine, including cpu benchmarks.
This is sample output - yours may be different.
2

hardinfo -am benchmark.so -f html > report.html

servermanaged · 2009-10-05 17:41:25 7
Grep auth log and print ip of attackers

Work for me on CentOS, grep and print ip addresses of ssh bruteforce attempts Show Sample Output
This is sample output - yours may be different.
```
192.33.68.00
192.168.1.66
155.63.49.15
```
1

egrep 'Failed password for invalid' /var/log/secure | awk '{print $13}' | uniq

servermanaged · 2009-10-04 18:08:13 7

Format ps command output

ps command gives the possibility to display information with custom formatting with the -o options followed by the format specifier list. Show Sample Output

ps ax -o "%p %U %u %x %c %n"

servermanaged · 2009-07-14 17:21:59 9

Compile a latex doc to generate index

When I make a latex document, I need to compile three times for generate an updated index of contents. With ruby on command line, I run this operation with a fast one liner.
This is sample output - yours may be different.
0

ruby -e " 3.times { system 'pdflatex mydoc.tex' } "

servermanaged · 2009-07-05 09:55:59 9
Export log to html file

Logtool is a nice tool that can export log file to various format, but its strength lies in the capacity of colorize logs. This command take a log as input and colorize it, then export it to an html file for a more confortable view. Logtool is part of logtool package.Tested on Debian.
This is sample output - yours may be different.
3

cat /var/log/auth.log | logtool -o HTML > auth.html

servermanaged · 2009-07-03 18:17:22 10
Open Vim with two windows

: new command allow to split a Vim screen in two separate windows. Each window can handle its own buffer. Passing the -c new options when Vim start cause to split screen automatically.
This is sample output - yours may be different.
1

vim -c new myfile

servermanaged · 2009-07-03 17:54:43 7
Display ncurses based network monitor

Nload is part of nload package, tested under Debian. Nload display network bandwidth statistics, -u m options stands for MBit unit measure.
This is sample output - yours may be different.
6

nload -u m eth0

servermanaged · 2009-07-03 17:47:38 12
Scan for viruses

Scan for viruses, recursively and print only infected files, with bell sound. Clamscan is part of clamav package. Tested on Debian.
This is sample output - yours may be different.
-2

clamscan -ir --bell ~user/

servermanaged · 2009-05-21 13:09:31 30
Notify me when users log in

Notifyme is a program that listen in background for users login, and report on login and logout. Users can be specified from a list or in a ~/notify.rc file. -C options force to display messages on the center of the screen.See man notifyme for more details. Part of notifyme package, tested on Debian. Show Sample Output
This is sample output - yours may be different.
```
root from :0.0 arrived!
```
4

notifyme -C `cat /etc/passwd | cut -d: -f1`

servermanaged · 2009-05-19 19:17:05 10
Unix security checker

From man tiger : Tiger is a package consisting of Bourne Shell scripts, C code and data files which is used for checking for security problems on a UNIX system. It scans system configuration files, file systems, and user configuration files for possible security problems and reports them. Show Sample Output
This is sample output - yours may be different.
```
Tiger security scripts *** 3.2.2, 2007.08.28.00.00 ***
20:57> Beginning security report for hob.juniper.
20:57> Starting file systems scans in background...
20:57> Checking password files...
20:57> Checking group files...
20:57> Checking user accounts...
20:58> Checking .rhosts files...
20:58> Checking .netrc files...
20:58> Checking ttytab, securetty, 
.....
```
-3

tiger

servermanaged · 2009-05-19 19:07:11 16
Top like mysql monitor

mytop is a top like monitor for displaying Mysql server statistic and performance. Part of mytop package ,tested on Debian.
This is sample output - yours may be different.
0

mytop --prompt

servermanaged · 2009-05-19 19:04:57 5
List installed hardware

Kudzu is available on CentOS, used for configuring and detecting new hardware device installed, is also usefull for device listing.
This is sample output - yours may be different.
-2

kudzu -p

servermanaged · 2009-05-12 10:34:59 5
Rearrange words from a file

Consider this line : random perl language this make possible is is possible to rearrange words with $F perl variable and word index, starting from 0. Show Sample Output
This is sample output - yours may be different.
```
#  perl -lane 'print "$F[3] $F[6] $F[2]"' myfile 
this is perl
```
0

perl -lane 'print "$F[0]:$F[1]:$F[2]"' myfile

servermanaged · 2009-05-09 21:30:55 4
Graphical display of wireless links

wmwave is part of wmwave package, when launched display a small wireless link monitor on your desktop with noise, level and link power.
This is sample output - yours may be different.
-4

wmwave

servermanaged · 2009-05-09 20:33:27 5
Change framebuffer font

setfont load vga console font. The default font directory is usually in /lib/kbd/consolefonts. Setfont is part of kbd package. Tested on CentOS.
This is sample output - yours may be different.
1

setfont cybercafe

servermanaged · 2009-05-09 20:08:47 3
Consolle based network interface monitor

ethstatus part of ethstatus package, is a consolle based monitor for network interfaces. Nicely display on screen a real time summary about bandwidth, speed and packets.
This is sample output - yours may be different.
6

ethstatus -i eth0

servermanaged · 2009-05-09 19:33:39 5
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Don't like the cut command? Tired of typing awk '{print $xxx}', try this

Get own public IP address

Returns your external IP address to the command line using only wget

Monitor incoming connections of proxies and balancers.

Maybe this will help you to monitor your load balancers or reverse proxies if you happen to use them. This is useful to discover TIME OUTS and this will let you know if one or more of your application servers is not connected by checking.

Last month

Work out last months value

Unbelievable Shell Colors, Shading, Backgrounds, Effects for Non-X

I've been using linux for almost a decade and only recently discovered that most terminals like putty, xterm, xfree86, vt100, etc., support hundreds of shades of colors, backgrounds and text/terminal effects. This simply prints out a ton of them, the output is pretty amazing. If you use non-x terminals all the time like I do, it can really be helpful to know how to tweak colors and terminal capabilities. Like: $ echo $'\33[H\33[2J'

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

recursive search and replace old with new string, inside files

If you can install rpl it's simpler to use and faster than combinations of find, grep and sed. See man rpl for various options. time on above operation: real 0m0.862s, user 0m0.548s, sys 0m0.180s using find + sed: real 0m3.546s, user 0m1.752s, sys 0m1.580s

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

delete a line from your shell history

If you're a moron like me, sometimes your fingers get away from you and you, for example, enter your password when you're already authenticated to ssh-agent, sudo, etc., and your password ends up in shell history. Here's how to get it out.

Alert visually until any key is pressed

I learned a few things reading this command. But I did run into a few issues: 1. On systems that don't use GNU echo (e.g. macOS 10.14.5 Mojave), the e option may not be supported. In this case ANSI escape codes will echoed as text and the terminal will not flash, like this: \e[?5h\e[38;5;1m A L E R T Thu Jun 20 16:31:29 PDT 2019 2. Since the read command strips\ignores leading backslashes, if a user types the backslash character once in the loop, it will not break. Typing backslash twice in a loop will break as expected. 3. The foreground color is set to red (\e[38;5;1m) on every loop. This could be set once before we call while, and then reset once when the loop breaks. 4. Instead of resetting the foreground color when it breaks, the video mode is set back to normal (\e[?5l). This has the effect of leaving the terminal text red until it is manually reset. The alternative I'm proposing here addresses these issues. I tested it on macOS and Arch Linux.

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