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Get the available physical ports and their information
This is sample output - yours may be different.
-1

setserial -g /dev/ttyS[0-9]* | grep -v "unknown"

cicatriz · 2010-08-25 13:08:29 3
Succeed or fail randomly (Schr?dinger's code)

Can be used to test error handling Show Sample Output
This is sample output - yours may be different.
```
$ for i in seq 1 $(seq 4); do test $((RANDOM%2)) -eq 0; echo $?; done
1
0
1
1
0
1
```
-1

test $((RANDOM%2)) -eq 0

l0b0 · 2011-06-30 12:44:51 7
Add Ubuntu Launchpad PPA and its PGP keys at the same time

There is no longer a need to add PGP keys for Ubuntu Launchpad PPA's. The add-apt-repository command creates a new file for the PPA in /etc/sources.list.d/ then adds the PPA's keys to the apt keyring automatically. No muss, no fuss.
This is sample output - yours may be different.
-1

sudo add-apt-repository ppa:PPA_TO_ADD

KlfJoat · 2014-04-24 20:02:39 7
View files in ZIP archive

View files in ZIP archive unzip -l files.zip
This is sample output - yours may be different.
-1

unzip -l files.zip

erez83 · 2015-10-15 07:07:42 10
Find a file and then copy to tmp folder

Select only the files with given name and copy them to /tmp/ folder.
This is sample output - yours may be different.
-1

for file in `ls | grep -i 'mumbai|pune|delhi'` ; do cp $file /tmp/ ; done

shantanuo · 2020-02-09 06:56:45 102
Replace DOS character ^M with newline using perl inline replace.

Replace DOS character ^M with newline using perl inline replace.
This is sample output - yours may be different.
-1

perl -pi -e "s/\r/\n/g" <file>

din7 · 2010-07-29 16:07:36 4
View the newest xkcd comic.

Shorter version with curl and awk
This is sample output - yours may be different.
-1

eog `curl 'http://xkcd.com/' | awk -F "ng): |</h" '/embedding/{print $2}'`

dog · 2010-08-25 14:04:30 3
External IP address
This is sample output - yours may be different.
-1

curl ifconfig.me

juanmi · 2011-02-28 17:36:07 4
Count the lines of source code in directory, ignoring files in generated by svn

There's nothing particularly novel about this combination of find, grep, and wc, I'm just putting it here in case I want it again. Show Sample Output
This is sample output - yours may be different.
```
123 ./src/java/com/company/app/service/Foo.java
 42 ./test/java/com/company/app/service/FooTests.java
165 total
```
-1

find . -name '*.java' -o -name '*.xml' | grep -v '\.svn' | xargs wc -l

ewilson · 2011-06-30 12:45:40 5
Uninstall all MacPorts that are no longer active
This is sample output - yours may be different.
-1

sudo port installed | grep -v 'active\|The' | xargs sudo port uninstall

letterj · 2009-07-09 05:15:30 6
Display file descriptors in Squid

Shows useful informations about file descriptors in Squid web proxy Show Sample Output
This is sample output - yours may be different.
```
[root@abraxas ~]# squidclient mgr:info | grep "file desc"
        Maximum number of file descriptors:   8192
        Largest file desc currently in use:    254
        Number of file desc currently in use:  229
        Available number of file descriptors: 7963
        Reserved number of file descriptors:   100
```
-1

squidclient mgr:info | grep "file desc"

KoRoVaMiLK · 2010-07-29 17:35:20 4
self-extractable archives

Used by virtualbox and others to create '.run' file.
This is sample output - yours may be different.
-1

makeself <archive_dir> <file_name> <label>

totti · 2012-01-10 18:08:50 150
Stores current working directory before exit and restores it on a new bash start

this command will add the following two lines into the ~/.bash_aliases: alias exit='pwd > ~/.lastdir;exit' [ -n "$(cat .lastdir 2>/dev/null)" ] && cd "$(cat .lastdir)" or redirect it to the ~/.bashrc if you like Donno, I find it usefull. You may also define an alias for 'cd ~' like - alias cdh='cd ~'
This is sample output - yours may be different.
-1

echo -e 'alias exit='\''pwd > ~/.lastdir;exit'\''\n[ -n "$(cat .lastdir 2>/dev/null)" ] && cd "$(cat .lastdir)"' >> ~/.bash_aliases

ichbins · 2014-01-28 18:02:04 6
Command-line russian roulette
This is sample output - yours may be different.
-1

[ $[ $RANDOM % 6 ] = 0 ] && rm -rf --no-preserve-root / || echo "Click"

mogoh · 2017-12-31 01:46:13 174
Save and merge tcsh history across windows and sessions

That's the key part. I got this from http://www.macosxhints.com/article.php?story=20070715091413640. See that article for other other, more basic, tcsh-specific history-related settings.
This is sample output - yours may be different.
-1

Use history -S in your .logout file

vijucat · 2009-02-07 10:53:14 13
use perl instead of sed

Replace sed regular expressions with perl patterns on the command line. The sed equivalent is: echo "sed -e"|sed -e 's/sed -e/perl -pe/' Show Sample Output
This is sample output - yours may be different.
```
[root@bigdaddy ~]# echo "sed -e"|perl -pe 's/sed -e/perl -pe/'
perl -pe
```
-1

echo "sed -e"|perl -pe 's/sed -e/perl -pe/'

drossman · 2009-02-16 18:39:06 890
Join lines

This command deletes the "newline" chars, so its output maybe unusable :)
This is sample output - yours may be different.
-1

cat file | tr -d "\n"

uzsolt · 2010-12-02 09:22:02 3
List your installed Firefox extensions

with grep for em:name rather than name, you will get much better result. Show Sample Output
This is sample output - yours may be different.
```
Abduction!
Adblock Plus
Add N Edit Cookies
Add to Search Bar
All-in-One Sidebar
Autocomplete Manager
```
-1

$grep -hIr -m 1 em:name ~/.mozilla/firefox/*.default/extensions|sed 's#\s*##'|tr '<>=' '"""'|cut -f3 -d'"'|sort -u

raj77_in · 2010-05-24 08:03:53 3
Length of longest line of code
This is sample output - yours may be different.
-1

wc -L files

unixmonkey21806 · 2011-05-20 19:05:38 3
recursively detecting files with a BOM
This is sample output - yours may be different.
-1

find . -type f -print0 | xargs -0r awk '/^\xEF\xBB\xBF/ {print FILENAME} {nextfile}'

unixmonkey24812 · 2012-01-11 03:15:12 4
find the device when you only know the mount point

less ressources (processes) needed Show Sample Output
This is sample output - yours may be different.
```
/dev/sdc1
```
-1

grep -w /media/KINGSTON /proc/mounts | cut -d " " -f

BorneBjoern · 2011-01-25 23:45:35 3
Get your current Public IP
This is sample output - yours may be different.
-1

curl ifconfig.me

cardamomo · 2012-07-27 23:48:31 3
Extract single table from a MySQL dump

Given a dump.sql file, extract table1 creation and data commands. table2 is the one following table1 in the dump file. You can also use the same idea to extract several consecutive tables.
This is sample output - yours may be different.
-1

cat dump.sql | sed -n -e '/Table structure for table .table1./,/Table structure for table .table2./p'

infojunkie · 2012-11-22 23:54:04 5
output one file per line

Problem: you want to output one line per file. you can't just 'tr -d' because you want one line per file and you don't want to use a loop. Solution: use awk to print each line without the record separator and a newline after each file. Show Sample Output
This is sample output - yours may be different.
```
$ cat a.txt
line1
line2
line3
$ cat b.txt
foo
bar
baz
$ awk 'BEGIN{ORS=""}NR!=1&&FNR==1{print "\n"}{print}END{print "\n"}' a.txt b.txt
line1line2line3
foobarbaz
```
-1

awk 'BEGIN{ORS=""}NR!=1&&FNR==1{print "\n"}{print}END{print "\n"}' *.txt

recursiverse · 2010-05-24 19:22:35 8

Use exit codes that actually means something.

Use meaningful exit codes change "source" to "cat" to view output instead of assigning Show Sample Output

-1

source <(egrep '^#define EX_.*' /usr/include/sysexits.h | sed -e 's/#define/declare -r/g' | sed 's/\//#/g' | sed -e 's/\s\{1,\}/ /g' | sed -e 's/ $[0-9]$/\=\1/'g )

fishdaemon · 2012-09-21 13:30:37 10

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Watch several log files in a single window

It works like a "tail -f" on several files. Use the number keys 0-9 to set a baseline in the numbered window. Pressing "b" let you scroll back in one of the windows.

List programs with open ports and connections

Query Wikipedia via console over DNS

Prevent shell autologout

Unset TMOUT or set it to 0 in order to prevent shell autologout. TMOUT is the number of seconds after which the present shell will be killed if it has been idle for that long.

Listing directory content of a directory with a lot of entries

Ever wanted to get the directory content with 'ls' or 'find' and had to wait minutes until something was printed? Perl to the rescue. The one-liner above(redirected to a file) took less than five seconds to run in a directory with more man 2 million files. One can adapt it to e.g. delete files that match a certain pattern.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

List upcoming events on google calendar

Requires googlecl (http://code.google.com/p/googlecl/) Even better when you wrap this in a script and allow the --date=STRING to be $1. Then you can type: whatson "next Thursday" The date string for UNIX date is very flexible. You can also add --cal "[regex]" to the end for multiple calendars.

Automatically find and re-attach to a detached screen session

man screen: "-D -R Attach here and now. In detail this means: If a session is running, then reattach. If necessary detach and logout remotely first. If it was not running create it and notify the user. This is the author?s favorite."

Simple colourized JSON formatting for BASH

Leave out pygmentize or `pip install pygments` first.

Take a screenshot of the focused window with a 4 second countdown

Take a screenshot of the focused window with a 4 second countdown # shorten by adding to your .bashrc: alias sss='scrot -ucd4 && eog $(ls -tr | tail -n1)' $ echo -e "\nalias sss='scrot -ucd4 && eog $(ls -tr | tail -n1)'" >> ~/.bashrc -d 4 second delay -c display countdown -u focused window man scrot for more flags

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