Commands by SuperFly

Commands by SuperFly (20)

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Download all Red Hat Manuals - A better way by user Flatcap

Let's give Flatcap credit for this elegant solution, instead of leaving it hidden as a comment. Tested on RHEL6 and it works. Nice and clean.
This is sample output - yours may be different.
1

curl -s https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/ | grep -o '[^"]*Linux/7/pdf[^"]*' | xargs -I{} wget https://access.redhat.com{}

SuperFly · 2015-05-11 11:57:20 11
all out

How to force a userid to log out of a Linux host, by killing all processes owned by the user, including login shells:
This is sample output - yours may be different.
11

pkill -KILL -u username

SuperFly · 2011-06-16 11:40:57 11
Remove all HTML tags from a file

A shorter version of command #3014, using awk instead of sed. Useful when scraping websites with a script.
This is sample output - yours may be different.
4

awk '{gsub("<[^>]*>", "")}1' file

SuperFly · 2011-01-06 13:24:34 5
Convert a string to "Title Case"

Converts the first letter of each word to upper case Show Sample Output
This is sample output - yours may be different.
```
$ echo "this is a test" | sed 's/.*/\L&/; s/[a-z]*/\u&/g'
This Is A Test
$
```
9

echo "this is a test" | sed 's/.*/\L&/; s/[a-z]*/\u&/g'

SuperFly · 2011-01-06 13:09:49 20
BASH one-liner to get the current week number

Not as cool as the python example, but it still works. Show Sample Output
This is sample output - yours may be different.
```
46
```
5

date +"%V"

SuperFly · 2010-11-17 14:59:31 6
Remove old unused kernels from Red Hat Enterprise Linux 5 & Fedora 12/13

Install using yum install yum-utils Options include: --oldkernels Remove old kernel and kernel-devel packages --count=KERNELCOUNT Number of kernel packages to keep on the system (default 2) use package-cleanup --help for a complete list
This is sample output - yours may be different.
2

/usr/bin/package-cleanup --oldkernels --count=3

SuperFly · 2010-09-02 11:18:13 4
Is today the last day of the month?

Nice simple example of something we can do in bash.
This is sample output - yours may be different.
2

[ `date --date='next day' +'%B'` == `date +'%B'` ] || echo 'end of month' && echo 'not end of month'

SuperFly · 2010-08-11 14:25:04 11
print contents of file from line 1 until we match regex

Start printing the contents of filename to stdout, until a matching line to regex is found, then stop.
This is sample output - yours may be different.
2

sed -n '1,/regex/p' filename

SuperFly · 2010-07-08 19:25:59 5
print contents of file from first match of regex to end of file

Search in "filename" for the first line to match regex, and print to stdout from the matching line to the end of the file.
This is sample output - yours may be different.
1

sed -n '/regex/,$p' filename

SuperFly · 2010-07-08 19:24:43 5
Big Countdown Clock with hours, minutes and seconds

Figlet is easy to find for download on the internet, and works for any text. Quite cool. Show Sample Output
This is sample output - yours may be different.
```
  ___   __    ____  _  _    _  _    __        _    __  __
 / _ \ / /_ _| ___|| || | _| || |  / /_      / \  |  \/  |
| | | | '_ (_)___ \| || |(_) || |_| '_ \    / _ \ | |\/| |
| |_| | (_) | ___) |__   _||__   _| (_) |  / ___ \| |  | |
 \___/ \___(_)____/   |_|(_)  |_|  \___/  /_/   \_\_|  |_|
```
4

watch -tn1 'date +%r | figlet'

SuperFly · 2010-06-22 10:59:16 8
Status of Snow Armageddon in Washington DC Metro from the command line...

The Washington DC Metro area is not accustomed to getting large snow storms... http://snowpocalypsedc.com/
This is sample output - yours may be different.
0

/usr/bin/links --source http://weather.noaa.gov/pub/data/forecasts/zone/md/mdz009.txt

SuperFly · 2010-02-05 17:44:45 5
Print the contents of $VARIABLE, six words at a time

Print out the contents of $VARIABLE, six words per line, ignoring any single or double quotes in the text. Useful when $VARIABLE contains a sentence that changes periodically, and may or may not contain quoted text.
This is sample output - yours may be different.
1

echo $VARIABLE | xargs -d'\40' -n 6 echo

SuperFly · 2010-01-20 15:12:53 6
Print a row of 50 hyphens

Change the number 50 to whatever number of characters you want. Change the character inside the double quotes to whatever you want printed.
This is sample output - yours may be different.
0

awk 'BEGIN{while (a++<50) s=s "-"; print s}'

SuperFly · 2010-01-06 16:16:35 38
Prints line numbers

Works in RHEL5 and derivatives.
This is sample output - yours may be different.
-1

nl <filename>

SuperFly · 2010-01-06 16:14:43 5
Display the output of a command from the first line until the first instance of a regular expression.

This command line will display the output of , from the first line of output, until the first time it sees a pattern matching . You could specify the regex pattern /^$/ to look for the first blank line, or /^foobar/ to look for the first line that starts with the word foobar.
This is sample output - yours may be different.
0

<your command here> | perl -n -e 'print "$_" if 1 ... /<regex>/;'

SuperFly · 2009-12-22 14:06:41 6
A function to output a man page as a pdf file

Tested on Fedora 12. This function will take a man page and convert it to pdf, saving the output to the current working directory. In Gnome, you can then view the output with "gnome-open file.pdf", or your favorite pdf viewer.
This is sample output - yours may be different.
15

function man2pdf(){ man -t ${1:?Specify man as arg} | ps2pdf -dCompatibility=1.3 - - > ${1}.pdf; }

SuperFly · 2009-11-27 12:49:49 14
Force an fsck on reboot

Force an fsck on reboot. Useful on a system where / has mounted read-only because of file system issues.
This is sample output - yours may be different.
2

shutdown -rF now

SuperFly · 2009-10-05 15:02:36 10
Detect if we are running on a VMware virtual machine

If you run this command on a VMWare Virtual Machine, it will return the string "VMware Virtual Platform". If you run it on a physical machine, it will return nothing. Useful for having a script determine if it's running on a VM or not. Of course, you must have dmidecode installed for this to work. Try it this way in a script: ISVM=$(dmidecode | awk '/VMware Virtual Platform/ {print $3,$4,$5}') Then test if $ISVM has text in it, or is blank.
This is sample output - yours may be different.
7

dmidecode | awk '/VMware Virtual Platform/ {print $3,$4,$5}'

SuperFly · 2009-09-25 14:46:35 21
A DESTRUCTIVE command to render a drive unbootable

THIS COMMAND IS DESTRUCTIVE. That said, lets assume you want to render your boot drive unbootable and reboot your machine. Maybe you want it to boot off the network and kickstart from a boot server for a fresh OS install. Replace /dev/fd0 with the device name of your boot drive and this DESTRUCTIVE command will render your drive unbootable. Your BIOS boot priority should be set to boot from HD first, then LAN.
This is sample output - yours may be different.
1

badblocks -vfw /dev/fd0 10000 ; reboot

SuperFly · 2009-09-04 16:57:51 5
Download entire commandlinefu archive to single file

'jot' does not come with most *nix distros, so we need to use seq to make it work. This version tested good on Fedora 11.
This is sample output - yours may be different.
5

for x in `seq 0 25 $(curl "http://www.commandlinefu.com/commands/browse"|grep "Terminal - All commands" |perl -pe 's/.+(\d+),(\d+).+/$1$2/'|head -n1)`; do curl "http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/$x" ; done > a.txt

SuperFly · 2009-08-27 11:02:53 8

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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Apache CLF access log format to CSV converter

- excel date compatible with a separate hour field - added a fixed 1 for easier request counter aggregation - split URL in directory, filename, fileext, query - used with tomcat valve with response bytes replaced by elapsed time

One liner to kill a process when knowing only the port where the process is running

List the size (in human readable form) of all sub folders from the current location

Simple and easy to remember. -h is human, -d1 = depth 1. disk usage, human, depth 1

Use file(1) to view device information

file(1) can print details about certain devices in the /dev/ directory (block devices in this example). This helped me to know at a glance the location and revision of my bootloader, UUIDs, filesystem status, which partitions were primaries / logicals, etc.. without running several commands. See also: $ file -s /dev/dm-* $ file -s /dev/cciss/* etc..

Command line calculator

works with fractions like 1/3.5

Super Speedy Hexadecimal or Octal Calculations and Conversions to Decimal.

^Hexadecimal Ten minus Octal Ten is Eight(in Decimal). $ echo "$(( 0xaf )) = $(( 0257 ))" ^Hexadecimal AF and Octal 257 are both Decimal 175.

Kill all processes belonging to a user

Define shell variable HISTIGNORE so that comments (lines starting with #) appear in shell history

I was surprised to find that with RedHat bash, I could not find any comment lines (begining with #) in my bash shell history. Surprised because in Mageia Linux this works. It turns out that RedHat's bash will keep comment lines if in my .bashrc, I define: export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?' Why have comment lines in shell history? It's a handy and convenient way to make proto-commands (to be completed later) and for storing brief text data that is searchable in shell history.

Remove security limitations from PDF documents using ghostscript (for Windows)

#4345 also works under windows

Find chronological errors or bad timestamps in a Subversion repository

Lists revisions in a Subversion repository with a timestamp that doesn't follow the revision numbering order. If everything is OK, nothing is displayed.

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