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Replace spaces in filenames with underscorees
This is sample output - yours may be different.
10

ls | while read f; do mv "$f" "${f// /_}";done

liam · 2009-08-27 16:43:56 8
Show directories in the PATH, one per line

This doesn't work in bash, but in zsh you can typeset -T to bind a scalar variable to an array. $PATH and $path behave this way by default.
This is sample output - yours may be different.
-4

print -l $path

Mikachu · 2009-08-27 16:33:04 3
Get Dollar-Euro exchage rate

You can get others rates changing the "EUR/US" part. look at the url: wap.kitco.com/exrate.wml to get more options. Show Sample Output
This is sample output - yours may be different.
```
0.7007
```
4

curl -s wap.kitco.com/exrate.wml | awk ' BEGIN { x=0; FS = "<" } { if ($0~"^<br/>") {x=0} if (x==1) {print $1} if ($0~"EUR/US") {x=1} }'

jamaese · 2009-08-27 16:30:19 5
An alarm clock using xmms2 and at

I like the order of the arguments better this way.
This is sample output - yours may be different.
4

at 6:00 <<< "xmms2 play"

Mikachu · 2009-08-27 16:30:07 3
get diskusage of files modified during the last n days

get diskusage of files (in this case logfiles in /var/log) modified during the last n days: sudo find /var/log/ -mtime -n -type f | xargs du -ch n -> last modified n*24 hours ago Numeric arguments can be specified as +n for greater than n, -n for less than n, n for exactly n. => so 7*24 hours (about 7 days) is -7 sudo find /var/log/ -mtime -7 -type f | xargs du -ch | tail -n1 Show Sample Output
This is sample output - yours may be different.
```
$ sudo find /var/log/ -mtime -7 -type f | xargs du -ch | tail -n1
25M     total

or

$ sudo find /var/log/ -mtime -7 -type f | xargs du -ch | grep total
25M     total
```
2

sudo find /var/log/ -mtime -7 -type f | xargs du -ch | tail -n1

alvinx · 2009-08-27 14:18:47 5
Unlock your KDE4.3 session remotely

The unlock command for KDE 4.3 has changed from krunner_lock, this process doesn't exist anymore. So here's the update :-) If qdbus complains about not being able to find X, put a "DISPLAY=:0 " (:0 being your X server display) in front of the command.
This is sample output - yours may be different.
6

qdbus org.kde.screenlocker /MainApplication quit

Alanceil · 2009-08-27 13:57:00 4
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 7
Show directories in the PATH, one per line

Shorter version. Show Sample Output
This is sample output - yours may be different.
```
/usr/bin
/bin
/usr/sbin
/sbin
/usr/local/bin
```
14

echo "${PATH//:/$'\n'}"

camspiers · 2009-08-26 23:12:05 9
scp a good script from host A which has no public access to host C, but with a hop by host B

Stop tormenting the poor animal cat! Also you should not that you need a private key not protected by a passphrase on middlehost that grants you access to securehost..
This is sample output - yours may be different.
0

ssh middlehost "ssh -a root@securehost '> nicescript'" < nicescript

0x89 · 2009-08-26 20:25:12 5
Find the average QTime for all queries ran within the last hour for solr
This is sample output - yours may be different.
-2

cat /service/solr/log/main/current | tai64nlocal | grep "$`date '+%F %H'`\|`date '+%F %H %M' | awk '{print $1" 0"$2-1":"$3}'`$" | grep QTime | awk '{print $NF}' | awk -F\= '{ s += $2} END {print s/NR}'

allrightname · 2009-08-26 14:02:02 3
Debian: Mark all dependent packages as manualy installed.

Debian: Mark all dependent packages as manually installed. So they are not automatically removed if you remove some meta package - like gnome-desktop-environment for example.
This is sample output - yours may be different.
2

sudo aptitude unmarkauto $(apt-cache depends some-deb-meta-package-name | grep Depends | cut -d: -f2)

yra · 2009-08-26 12:56:33 8
Display a block of text with vim with offset, like with AWK

By using vim, you can also filter content on stdout, using vim's extra power, like search pattern offset! No more awk of course, sorry. details : -e ex mode -s silent -c 'ex command' : global + start and end pattern + offset print (p) -cq : quit Show Sample Output
This is sample output - yours may be different.
```
$cat file.txt
begin
here too
start_pattern
pipo
et
molo
font
du
ski
stop_pattern
plus
more
here

$vim -e -s -c 'g/start_pattern/+1,/stop_pattern/-1 p' -cq file.txt
pipo
et
molo
font
du
ski
```
0

vim -e -s -c 'g/start_pattern/+1,/stop_pattern/-1 p' -cq file.txt

syladmin · 2009-08-26 10:22:27 6
Echo the local IP addresses of the machines on your local network

If you need to ssh into a computer on the local network but you're unsure of the ip to use, then ping them and see if you get a response. If you do, print out the address you got it from. Adjust the range to suit your network.
This is sample output - yours may be different.
-2

for i in 192.168.1.{61..71};do ping -c 1 $i &> /dev/null && echo $i;fi;done

AlecSchueler · 2009-08-26 06:04:24 11
An alarm clock using xmms2 and at

Nice little alarm clock to wake you up on time (hopefully). You can also do 'echo "vlc path/to/song" | at 6:00
This is sample output - yours may be different.
1

echo "xmms2 play" | at 6:00

Vrekk · 2009-08-26 04:20:24 5
Emulate sleep in DOS/BAT

In the vein of "can you do it better", here is my take on using "ping" to emulate sleep in a DOS/BAT script. If one can use ping at all then the multicast address will be valid but will not respond. By doing only one ping (-n 1) and setting a timeout in milliseconds (-w 10000) you have a fairly accurate timer. This example gives about a 10 second sleep.
This is sample output - yours may be different.
-1

ping -n 1 -w 10000 224.0.0.0

DocGyver · 2009-08-26 02:25:07 9
Download entire commandlinefu archive to single file

This is an extension of a previous command by satyavvd on 2009-07-23 12:04:02, but this one grabs the whole archive. Hard coded numbers in previous script capped number of commands that could be fetched. This one grabs them all regardless of how big the archive gets. Show Sample Output
This is sample output - yours may be different.
```
# SSH connection through host in the middle
ssh -t reachable_host ssh unreachable_host

# A fun thing to do with ram is actually open it up and take a peek. This command will show you all the string (plain text) values in ram
sudo dd if=/dev/mem | cat | strings

# Watch Star Wars via telnet
telnet towel.blinkenlights.nl

# Backticks are evil
echo "The date is: $(date +%D)"
```
0

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

stinkerweed999 · 2009-08-25 21:57:15 6
Sort file greater than a specified size in human readeable format including their path and typed by color, running from current directory

1. find file greater than 10 MB 2. direct it to xargs 3. xargs pass them as argument to ls Show Sample Output
This is sample output - yours may be different.
```
265M ./2009_08_24/DCIM/100CANON/MVI_1679.AVI
 58M ./2009_08_24/DCIM/100CANON/MVI_1816.AVI
 31M ./2009_08_24/DCIM/100CANON/MVI_1824.AVI
 27M ./2009_08_24/DCIM/100CANON/MVI_1815.AVI
```
9

find ./ -size +10M -type f -print0 | xargs -0 ls -Ssh1 --color

eastwind · 2009-08-25 18:40:47 8
Do a search-and-replace in a file after making a backup
This is sample output - yours may be different.
3

perl -i'.bak' -pe 's/old/new/g' <filename>

unixmonkey5248 · 2009-08-25 17:37:59 4
Do a search-and-replace in a file after making a backup

"&&" runs sed if and only if the backup completed and /bin/cp exited cleanly. Works for multiple files; just specify multiple filenames (or glob). Use -v switch for cp to play it safe.
This is sample output - yours may be different.
0

for file in <filename>; do cp $file{,.bak} && sed 's/old/new/g' $file.bak > $file; done

Cenobite · 2009-08-25 16:19:45 5
Parallel mysql dump restore

this command works with one gziped file per table, and restore 4 tables in parallel. Show Sample Output
This is sample output - yours may be different.
```
see mytop output
```
3

find -print0 | xargs -0 -n 1 -P 4 -I {} sh -c "zcat '{}' | mysql nix"

skygreg · 2009-08-25 15:05:55 15
convert unixtime to human-readable
This is sample output - yours may be different.
2

perl -e 'print scalar(gmtime(1234567890)), "\n"'

andrew112358 · 2009-08-25 15:00:52 4
convert unixtime to human-readable

this works on Solaris, so not better than the "only-GNU"-tool :-( I think, there is no one-liner for this, that will work on all *nix-es Show Sample Output
This is sample output - yours may be different.
```
# currentEpoch='1244172897'
# echo "0t${currentEpoch}=Y" | /usr/bin/adb
                2009 Jun  5 05:34:57
```
0

echo "0t${currentEpoch}=Y" | /usr/bin/adb

verboEse · 2009-08-25 12:17:01 4
convert unixtime to human-readable
This is sample output - yours may be different.
27

date -d @1234567890

elzapp · 2009-08-25 11:18:04 13
convert strings toupper/tolower with tr
This is sample output - yours may be different.
2

echo "aBcDeFgH123" | tr a-z A-Z

Josay · 2009-08-25 11:06:31 3
move a lot of files over ssh

copy files to a ssh server with gzip compression
This is sample output - yours may be different.
14

rsync -az /home/user/test user@sshServer:/tmp/

peshay · 2009-08-25 10:45:15 6
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Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Monitor cpu in realtime.

Show current working directory of a process

See system users

Backup trought SSH

Look for English words in /dev/urandom

* to get the English dictionary: wget http://www.mavi1.org/web_security/wordlists/webster-dictionary.txt

Merges given files line by line

In the above example all files have 4 lines. In "file1" consecutive lines are: "num, 1, 2, 3", in "file2": "name, Jack, Jim, Frank" and in "file3": "scores, 1300, 1100, 980". This one liner can save considerate ammount of time when you're trying to process serious portions of data. "-d" option allows one to set series of characters to be used as separators between data originating from given files.

Does a traceroute. Lookup and display the network or AS names and AS numbers.

From the man page. lft ? display the route packets take to a network host/socket using one of several layer-4 protocols and methods; optionally show heuristic network information in transitu -A Enable lookup and display of of AS (autonomous system) numbers (e.g., [1]). This option queries one of several whois servers (see options 'C' and 'r') in order to ascertain the origin ASN of the IP address in question. By default, LFT uses the pWhoIs service whose ASN data tends to be more accurate and more timely than using the RADB as it is derived from the Internet's global routing table. -N Enable lookup and display of network or AS names (e.g., [GNTY-NETBLK-4]). This option queries Prefix WhoIs, RIPE NCC, or the RADB (as requested). In the case of Prefix WhoIs or RADB, the network name is displayed. In the case of RIPE NCC, the AS name is displayed.

Run a script in parrallel over ssh

Runs a local script over ssh assuming ssh keys are in place. -P argument prints results to stdout. # Uses - https://code.google.com/p/parallel-ssh/

count IPv4 connections per IP

usefull in case of abuser/DoS attacks.

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