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Edit all files found having a specific string found by grep

This will drop you into vim to edit all files that contain your grep string.
This is sample output - yours may be different.
0

grep -ir 'foo' * | awk '{print $1}' | sed -e 's/://' | xargs vim

elubow · 2009-09-03 15:12:27 3
How far is Mac OS X 10.6 from 64-bit?

Next time you see a mac fanboy bragging about 64-bitness of 10.6 give him this so he might sh? Show Sample Output
This is sample output - yours may be different.
```
   127	Mach-O 64-bit kext bundle x86_64
   314	Mach-O object i386
```
-1

file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -i x86_64 |nl |tail -1 |cut -f1 -f3 && file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -v x86_64 |nl |tail -1 |cut -f1 -f3

commandlinefu · 2009-09-03 14:28:02 6

Ultimate current directory usage command

biggest->small directories, then biggest->smallest files Show Sample Output

-3

O=$IFS;IFS=$'\n'; D=$(for f in *;do [[ -d $f ]] && du -sh "$f";done | sort -gr);F=$(for f in *;do [[ -f $f ]] && du -sh "$f";done | sort -gr);IFS=$O;echo "$D";echo "$F"

Viperlin · 2009-09-03 11:39:50 6

Sort a character string

another possibility
This is sample output - yours may be different.
0

echo sortmeplease|sed 's/./&\n/g'|sort|tr -d '\n'

foob4r · 2009-09-03 10:37:57 3
When was your OS installed?

Show time and date when you installed your OS. Show Sample Output
This is sample output - yours may be different.
```
$ ls -lct /etc | tail -1 | awk '{print $6, $7}'
2009-08-25 13:25
```
10

ls -lct /etc | tail -1 | awk '{print $6, $7}'

MrMerry · 2009-09-03 10:26:37 13
Sort a character string

using awk missed the last char thanks @Josay Show Sample Output
This is sample output - yours may be different.
```
aeeelmoprsst
```
-1

echo sortmeplease | awk '{l=split($1,a,"");asort(a);while(x<=l){printf "%s",a[x];x++ }print "";}'

foob4r · 2009-09-03 10:22:39 4
Let your computer lull you to sleep

Can change language and speed, see espeak man page for options. (Install espeak in your linux distro via yum or apt-get) For insomniacs you may need to enclose in a while true; do ...; done loop ;) Show Sample Output
This is sample output - yours may be different.
```
1 sheep, 2 sheep, 3 sheep, ...

ZZZZZzzzzzzzzzz...
```
7

echo {1..199}" sheep," | espeak -v english -s 80

MrMerry · 2009-09-03 10:08:12 7
Create a large test file (taking no space).
This is sample output - yours may be different.
5

dd bs=1 seek=2TB if=/dev/null of=ext3.test

Superhuman · 2009-09-03 08:35:20 3
Ultimate current directory usage command

use manpages, they give you "ultimate commands" "ls -SshF --color" list by filesize (biggest at the top) "ls -SshFr --color" list by filesize in reverse order (biggest at the bottom) Show Sample Output
This is sample output - yours may be different.
```
> ls
total 24K
4.0K css/  4.0K images/  8.0K index.html  8.0K index.html~
```
-3

ls -shF --color

Viperlin · 2009-09-03 05:45:33 9
Add user to group on OS X 10.5

adding users to groups on OS X is not a straightforward process, you need to use the new in built in Directory Service command line utility...
This is sample output - yours may be different.
0

sudo dscl localhost -append /Local/Default/Groups/admin GroupMembership username

kulor · 2009-09-03 04:40:10 3
Sort a character string

Sorts a character string, using common shell commands. Show Sample Output
This is sample output - yours may be different.
```
$ echo sortmeplease | grep -o . | sort | tr -d '\n'; echo
aeeelmoprsst
```
1

echo sortmeplease | grep -o . | sort | tr -d '\n'; echo

MrMerry · 2009-09-03 00:52:49 28
floating point operations in shell scripts

using bc is for sissies. dc is much better :-D Polish notation will rule the world... Show Sample Output
This is sample output - yours may be different.
```
.60000
```
2

echo "5 k 3 5 / p" | dc

xamaco · 2009-09-03 00:21:54 3
Cleanup firefox's database.

For Mac OS X users only
This is sample output - yours may be different.
1

find ~/Library/Application\ Support/Firefox/ -type f -name "*.sqlite" -exec sqlite3 {} VACUUM \;

stanishjohnd · 2009-09-02 23:12:13 3

List of reverse DNS records for a subnet

This command uses nmap to perform reverse DNS lookups on a subnet. It produces a list of IP addresses with the corresponding PTR record for a given subnet. You can enter the subnet in CDIR notation (i.e. /24 for a Class C)). You could add "--dns-servers x.x.x.x" after the "-sL" if you need the lookups to be performed on a specific DNS server. On some installations nmap needs sudo I believe. Also I hope awk is standard on most distros. Show Sample Output

nmap -R -sL 209.85.229.99/27 | awk '{if($3=="not")print"("$2") no PTR";else print$3" is "$2}' | grep '('

netsaint · 2009-09-02 16:33:15 5

floating point operations in shell scripts

-l auto-selects many more digits (but you can round/truncate in your head, right) plus it loads a few math functions like sin(). Show Sample Output
This is sample output - yours may be different.
```
.56464247339503535720
```
3

bc -l <<< s(3/5)

akg240 · 2009-09-02 15:41:39 9
list all hd partitions

Only one command and not dependant on full read access to the devices. Show Sample Output
This is sample output - yours may be different.
```
sda1
sda2
sda3
sda5
sda6
sda7
sda8
sda9
sdb1
```
3

awk '/d.[0-9]/{print $4}' /proc/partitions

akg240 · 2009-09-02 15:26:03 6
list all hd partitions

Show Sample Output
This is sample output - yours may be different.
```
hdc1
hdc2
hdc5
hdd1
hdd2
hdd5
```
0

fdisk -l |grep -e '^/' |awk '{print $1}'|sed -e "s|/dev/||g"

opexxx · 2009-09-02 13:03:04 3
Today's date on a yearly calendar...

Show today date on a yearly calendar.
This is sample output - yours may be different.
-1

cal -y

andrepuel · 2009-09-02 12:57:23 49
free swap

simple way to show free swap Show Sample Output
This is sample output - yours may be different.
```
2979
```
-2

free -m | awk '/Swap/ {print $4}'

voyeg3r · 2009-09-02 11:46:17 3
free swap

free swap
This is sample output - yours may be different.
0

free -b | grep "Swap:" | sed 's/ * / /g' | cut -d ' ' -f2

opexxx · 2009-09-02 07:16:34 39
to see about php configure

see about php install configure Show Sample Output
This is sample output - yours may be different.
```
/usr/bin/php -i | grep configure
```
1

$php_dir/bin/php -i | grep configure

Yousri · 2009-09-02 06:44:12 3
Cleanup firefox's database.
This is sample output - yours may be different.
18

find ~/.mozilla/firefox/ -type f -name "*.sqlite" -exec sqlite3 {} VACUUM \;

grokskookum · 2009-09-01 21:45:46 10
dig this
This is sample output - yours may be different.
-1

for dnsREC in $(curl -s http://www.iana.org/assignments/dns-parameters |grep -Eo ^[A-Z\.]+\ |sed 's/TYPE//'); do echo -n "$dnsREC " && dig +short $dnsREC IANA.ORG; done

commandlinefu · 2009-09-01 03:11:18 3
Reinstall Grub
This is sample output - yours may be different.
2

sudo grub-install --recheck /dev/sda1

theIndianMaiden · 2009-09-01 02:06:28 16
find files containing text

I find this format easier to read if your going through lots of files. This way you can open the file in any editor and easily review the file
This is sample output - yours may be different.
1

grep -lir "sometext" * > sometext_found_in.log

shaiss · 2009-08-31 23:48:45 3
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Short one line while loop that outputs parameterized content from one file to another

The above is an example of grabbing only the first column. You can define the start and end points specifically by chacater position using the following command: $ while read l; do echo ${l:10:40}; done < three-column-list.txt > column-c10-c40.txt Of course, it doesn't have to be a column, or extraction, it can be replacement $ while read l; do echo ${l/foo/bar}; done < list-with-foo.txt > list-with-bar.txt Read more about parameter expansion here: http://wiki.bash-hackers.org/syntax/pe Think of this as an alternative to awk or sed for file operations

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

-k (kill option ) . To kill all processes accessing this port

for all who don't have the watch command

List your largest installed packages.

Calculates the size on disk for each package installed on the filesystem (or removed but not purged). This is missing the $ | sort -rn which would put the biggest packges on top. That was purposely left out as the command is slightly on the slow side Also you may need to run this as root as some files can only be checked by du if you can read them ;)

Get all IPs via ifconfig

and, a lot uglier, with sed: $ ifconfig | sed -n '/inet addr:/s/[^:]\+:$\S\+$.*/\1/p' Edit: Wanted to be shorter than the perl version. Still think that the perl version is the best..

Delay execution until load average falls under 1.5

If shell escaping of the command is problematic, you can write the command to a file first: $ batch

Search for a string inside all files in the current directory

This is how I typically grep. -R recurse into subdirectories, -n show line numbers of matches, -i ignore case, -s suppress "doesn't exist" and "can't read" messages, -I ignore binary files (technically, process them as having no matches, important for showing inverted results with -v) I have grep aliased to "grep --color=auto" as well, but that's a matter of formatting not function.

Create QR codes from a URL.

QR codes are those funny square 2d bar codes that everyone seems to be pointing their smart phones at. Try the following... $ qrurl http://xkcd.com Then open qr.*.png in your favorite image viewer. Point your the bar code reader on your smart phone at the code, and you'll shortly be reading xkcd on your phone. URLs are not the only thing that can be encoded by QR codes... short texts (to around 2K) can be encoded this way, although this function doesn't do any URL encoding, so unless you want to do that by hand it won't be useful for that.

Go up multiple levels of directories quickly and easily.

Change to your taste. Much quicker than having to add 'cd' every time. Add it to your .bashrc or .bash_profile.

Find usb device in realtime

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

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