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Get Interface's IP on Mac
This is sample output - yours may be different.
0

ipconfig getifaddr <Interface>

commandlinefu · 2009-08-10 15:04:44 3
Get the size of all the directories in current directory

OSX's BSD version of the du command uses the -d argument instead of --max-depth.
This is sample output - yours may be different.
3

du -hd 1

Tuirgin · 2009-08-10 13:11:22 3
back up your commandlinefu contributed commands

Use `zless` to read the content of your *rss.gz file: zless commandlinefu-contribs-backup-2009-08-10-07.40.39.rss.gz Show Sample Output
This is sample output - yours may be different.
```
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 20487    0 20487    0     0  18344      0 --:--:--  0:00:01 --:--:-- 97557
```
10

curl http://www.commandlinefu.com/commands/by/<your username>/rss|gzip ->commandlinefu-contribs-backup-$(date +%Y-%m-%d-%H.%M.%S).rss.gz

linuxrawkstar · 2009-08-10 12:43:33 38

Picture Renamer

jhead is a very nice tool to do all sorts of things with photographs, in a batch-oriented way. It has a specific function to rename files based on dates, and the format I used above was just an example. Show Sample Output

jhead -n%Y%m%d-%H%M%S *.jpg

sitaramcUnused · 2009-08-10 03:49:30 6

Picture Renamer

Renames all the jpg files as their timestamps with ".jpg" extension. Show Sample Output
This is sample output - yours may be different.
```
2008-09-26 20-59-03.jpg  2008-10-25 22-27-45.jpg  2008-12-19 22-07-51.jpg
2008-10-02 15-01-42.jpg  2008-10-25 22-28-02.jpg  2008-12-19 22-07-59.jpg
2008-10-02 15-25-34.jpg  2008-11-04 16-44-20.jpg  2008-12-19 22-09-54.jpg
```
0

ls -1 *.jpg | while read fn; do export pa=`exiv2 "$fn" | grep timestamp | awk '{ print $4 " " $5 ".jpg"}' | tr ":" "-"`; mv "$fn" "$pa"; done

axanc · 2009-08-10 00:52:22 3
Define an alias with a correct completion

In Bash, when defining an alias, one usually loses the completion related to the function used in that alias (that completion is usually defined in /etc/bash_completion using the complete builtin). It's easy to reuse the work done for that completion in order to have smart completion for our alias. That's what is done by this command line (that's only an example but it may be very easy to reuse). Note 1 : You can use given command line in a loop "for old in apt-get apt-cache" if you want to define aliases like that for many commands. Note 2 : You can put the output of the command directly in your .bashrc file (after the ". /etc/bash_completion") to always have the alias and its completion Show Sample Output
This is sample output - yours may be different.
```
# at the beginning
$ sudo apt-get in<tab> # gives "sudo apt-get install" (smart completion)
# then su-apt-get='sudo apt-get'
$ su-apt-get in<tab> # gives "su-apt-get in" (no completion)
# finally with given command
$ su-apt-get in<tab> # gives "su-apt-get install" (smart completion \o/)
```
4

old='apt-get'; new="su-${old}"; command="sudo ${old}"; alias "${new}=${command}"; $( complete | sed -n "s/${old}$/${new}/p" ); alias ${new}; complete -p ${new}

Josay · 2009-08-10 00:15:05 4
Convert every eps in a directory to pdf

Converts every *.eps file to a *.pdf file
This is sample output - yours may be different.
1

for f in *.eps;do ps2pdf -dEPSCrop $f `basename $f .eps`.pdf; done

rader5 · 2009-08-09 20:58:07 4
Replace Every occurrence of a word in a file

Replace 'this' with 'that'
This is sample output - yours may be different.
2

perl -p -i -e 's/this/that/g' filename

rader5 · 2009-08-09 20:53:50 8
currently mounted filesystems in nice layout

since fuse mounts do not appear in /etc/mtab (fuse can't write there, dunno if it would if it could) this is propably a better way.
This is sample output - yours may be different.
11

column -t /proc/mounts

unixmonkey5049 · 2009-08-09 17:00:41 6
Script para hacer un acopia d ela base de datos mysql

Tres lineas en un shell script para copiar la base de datos diaramente
This is sample output - yours may be different.
-2

FECHA=$(date +"%F") FINAL="$FECHA.sql.gz" mysqldump -h localhost -u user --password="pass" --opt jdiaz61_lupajuridica | gzip > /home/jdiaz61/www/backup/$FINAL

juancabo · 2009-08-09 14:51:46 5
Convert one file from ISO-8859-1 to UTF-8.

Nothing fancy it just converts one file from one character encoding into another one.
This is sample output - yours may be different.
3

iconv --from-code=ISO-8859-1 --to-code=UTF-8 iso.txt > utf.txt

jsiei97 · 2009-08-09 14:22:09 5
Remove newlines from output

Remove newlines from output. One character shorter than awk /./ filename and doesn't use a superfluous cat. To be fair though, I'm pretty sure fraktil was thinking being able to nuke newlines from any command is much more useful than just from one file.
This is sample output - yours may be different.
7

grep . filename

TheMightyBuzzard · 2009-08-09 05:33:58 12
Get your external IP address if your machine has a DNS entry

Easy way to see your real external IP Show Sample Output
This is sample output - yours may be different.
```
127.0.0.1
```
1

curl www.whatismyip.com/automation/n09230945.asp

dunka · 2009-08-09 04:08:41 3
Update program providing java on Debian

Lets you set all the java alternatives at once to a matching version. Also has options for just changing the jre or the plugin.
This is sample output - yours may be different.
2

update-java-alternatives

stuart · 2009-08-09 02:43:06 6
Stage only portions of the changes to a file.
This is sample output - yours may be different.
4

git add --patch <filename>

stuart · 2009-08-09 02:24:43 3
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

cat? dd? RTFM
This is sample output - yours may be different.
27

sudo strings /dev/mem

point_to_null · 2009-08-09 02:07:26 12
Get your external IP address if your machine has a DNS entry
This is sample output - yours may be different.
4

dig +short $HOSTNAME

stuart · 2009-08-09 02:05:38 5
Remove newlines from output

?Cat and grep? You can use only grep ("grep \. filename"). Better option is awk.
This is sample output - yours may be different.
1

awk /./ filename

point_to_null · 2009-08-09 02:04:46 4
Remove newlines from output

Pipe any output to "grep ." and blank lines will not be printed.
This is sample output - yours may be different.
3

cat filename | grep .

fraktil · 2009-08-09 01:00:59 4
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
This is sample output - yours may be different.
6

strings /dev/mem|less

fraktil · 2009-08-09 00:56:06 8
32 bits or 64 bits?

Easy and direct way to find this out. Show Sample Output
This is sample output - yours may be different.
```
32
```
124

getconf LONG_BIT

caiosba · 2009-08-08 21:22:19 60
Get your external IP address if your machine has a DNS entry

Using DynDNS or a similar service not only allows access to your home machine from outside without needing to know what IP the ISP has assigned to it but it also comes in handy if you want to know your external IP address. The only purpose of the sed command is to remove the leading "host.na.me has address " part from the output. If you don't need to discard it you can simply use host $HOSTNAME
This is sample output - yours may be different.
1

host $HOSTNAME|cut -d' ' -f4

penpen · 2009-08-08 12:39:00 5
get time in other timezones

On Ubuntu, if tzwatch is installed, then you can call up in terminal the output for every time zone configured in gWorldClock. Show Sample Output
This is sample output - yours may be different.
```
Fri Aug  7 18:23:49 PDT 2009   Local
Sat Aug  8 11:23:49 EST 2009   Australia/Sydney
Sat Aug  8 02:23:49 WEST 2009   Europe/Lisbon
Sat Aug  8 02:23:49 BST 2009   Europe/London
```
5

tzwatch

terry2wa · 2009-08-08 01:26:08 3
get time in other timezones

On Ubuntu, if tzwatch is installed, then you can call up in terminal the output for every time zone configured in gWorldClock. Show Sample Output
This is sample output - yours may be different.
```
Fri Aug  7 18:23:49 PDT 2009   Local
Sat Aug  8 11:23:49 EST 2009   Australia/Sydney
Sat Aug  8 02:23:49 WEST 2009   Europe/Lisbon
Sat Aug  8 02:23:49 BST 2009   Europe/London
```
0

tzwatch

terry2wa · 2009-08-08 01:25:50 4
Get the size of all the directories in current directory
This is sample output - yours may be different.
7

du --max-depth=1

Octave · 2009-08-08 00:46:29 15
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What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Displays user-defined ps output and pidstat output about the top CPU or MEMory users.

It grabs the PID's top resource users with $(ps -eo pid,pmem,pcpu| sort -k 3 -r|grep -v PID|head -10) The sort -k is sorting by the third field which would be CPU. Change this to 2 and it will sort accordingly. The rest of the command is just using diff to display the output of 2 commands side-by-side (-y flag) I chose some good ones for ps. pidstat comes with the sysstat package(sar, mpstat, iostat, pidstat) so if you don't have it, you should. I might should take off the timestamp... :|

Installing debian on fedora (chrooted)

Randomize lines (opposite of | sort)

random(6) - random lines from a file or random numbers

Reload all sysctl variables without reboot

Reload all defined kernel variables from /etc/sysctl.conf(if no parameter after -p is given) without the old myth "Ah, you'll need to reboot to apply those variables"...

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Signals list by NUMBER and NAME

This command seems to achieve the similar/same goal.

Print just line 4 from a textfile

this method should be the fastest

Build an exhaustive list of maildir folders for mutt

Of course, you can adjust "Maildir" to your config...

which procs have $PATH_REGEX open?

faster than lsof by at least x2 on my box.

Kill all processes that listen to ports begin with 50 (50, 50x, 50xxx,...)

Run netstat as root (via sudo) to get the ID of the process listening on the desired socket. Use awk to 1) match the entry that is the listening socket, 2) matching the exact port (bounded by leading colon and end of column), 3) remove the trailing slash and process name from the last column, and finally 4) use the system(…) command to call kill to terminate the process. Two direct commands, netstat & awk, and one forked call to kill. This does kill the specific port instead of any port that starts with 50. I consider this to be safer.

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