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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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Show the PATH, one directory per line (part 2)

Here is another way to show the path, one directory per line. The command `tr` translates the colon into the new line, taking input from the $PATH variable

Follow tail by name (fix for rolling logs with tail -f)

If you use 'tail -f foo.txt' and it becomes temporarily moved/deleted (ie: log rolls over) then tail will not pick up on the new foo.txt and simply waits with no output. 'tail -F' allows you to follow the file by it's name, rather than a descriptor. If foo.txt disappears, tail will wait until the filename appears again and then continues tailing.

Find the 10 users that take up the most disk space

Limit bandwidth usage by apt-get

Limits the usage of bandwidth by apt-get, in the example the command will use 30Kb/s ;) It should work for most apt-get actions (install, update, upgrade, dist-upgrade, etc.)

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

grep for minus (-) sign

Use flag "--" to stop switch parsing

for all who don't have the watch command

#Usage: watch timeinsecond "command"

diff will usually only take one file from STDIN. This is a method to take the result of two streams and compare with diff. The example I use to compare two iTunes libraries but it is generally applicable.

diff is designed to compare two files. You can also compare directories. In this form, bash uses 'process substitution' in place of a file as an input to diff. Each input to diff can be filtered as you choose. I use find and egrep to select the files to compare.

power off system in X hours form the current time, here X=2

scroll file one line at a time (w/only UNIX base utilities)

usage examples ls largedir |rd lynx -dump largewebsite.com |rd rd < largelogfile

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