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How many lines does the passwd file have?
This is sample output - yours may be different.
-1

cat /etc/passwd | wc -l

wilbercarmona · 2011-06-03 00:05:20 26
Get info `iostat -En` for all disks with Hardware Errors - works on Solaris and Solaris forks

This helps quickly get information for each disk that is seemingly having hardware issues.
This is sample output - yours may be different.
-1

iostat -En $(iostat -en|grep c#t|awk '$2 > 0 {print $NF}')

unixmonkey28207 · 2011-12-09 15:54:28 4
Disk usage skipping mount points (even top-level ones)

Other solutions that involve doing du -sx /* are incomplete because they will still descend other top-level filesystems are that mounted directly at "/" because the * expands to explicitly include all files and directories in "/", and du will still traverse them even with -x because you asked it to by supplying the directory name as a parameter (indirectly via "*"). Show Sample Output
This is sample output - yours may be different.
```
4.0K    /mnt
4.0K    /srv
8.0K    /media
16K     /lost+found
7.4M    /etc
25M     /home
83M     /boot
219M    /root
766M    /tmp
2.7G    /usr
8.3G    /opt
11G     /var
```
-1

for a in /*; do mountpoint -q -- "$a" || du -shx "$a"; done | sort -h

dmmst19 · 2024-02-28 01:43:19 54
do a release upgrade in ubuntu

release upgrades are major upgrades as from 8.04 to 8.10 or from 8.10 to 9.04 update-manager-core must be installed: sudo apt-get install update-manager-core in some cases you must edit '/etc/update-manager/release-upgrades' and set 'Prompt=normal'
This is sample output - yours may be different.
-1

do-release-upgrade

dizzgo · 2009-03-25 07:25:33 14
full text(CJK) search mails and link the result to $MAILDIR/bingo/cur/
This is sample output - yours may be different.
-1

recoll -t -q "keyword" | grep message/rfc822 | sed -s 's,^.*$'$MAILDIR'[^]]*$\].*$,\"\1\",' | xargs ln -sft $MAILDIR/bingo/cur/

s5unty · 2011-12-09 17:22:51 3
Move itens from subdirectories to current directory

You WILL have problems if the files have the same name. Use cases: consolidate music library and unify photos (especially if your camera separates images by dates). After running the command and verifying if there was no name issues, you can use ls -d */ | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs rm -r to remove now empty subdirectories.
This is sample output - yours may be different.
-1

ls -d */* | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs mv -t $(pwd)

leovailati · 2010-03-01 23:43:26 6
calculate in commandline with dc

Us dc instead of bc. RPN FTW!!! Show Sample Output
This is sample output - yours may be different.
```
2
```
-1

dc -e "1 1 + p"

stubby · 2010-08-08 23:14:30 3
Quickly find files and folders in the current directory

These should be a little faster since they don't have to spawn grep.
This is sample output - yours may be different.
-1

ff() { find -maxdepth 3 -type f -iname "$1"; }; fd() { find -maxdepth 4 -type d -iname "$1"; }

plasticboy · 2012-08-15 15:04:48 3
Merge only certain pdfs in a directory
This is sample output - yours may be different.
-1

gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=merged.pdf -dBATCH `ls | grep foo`

Arasithil · 2014-09-19 16:00:32 8
calculate in commandline with perl
This is sample output - yours may be different.
-1

perl -e 'print 1+1 ."\n";'

stubby · 2010-08-08 23:19:10 3
Use socat to create a largefile
This is sample output - yours may be different.
-1

echo | socat -u - file:/tmp/swapfile,create,largefile,seek=10000000000000

madrasi · 2011-02-08 00:30:38 4
Find and delete thunderbird's msf files to make your profile work quickly again.

The thunderbird message datastores get corrupt some times causing random failures, compaction to fail and general suck in thunderbird. Removing them causes thunderbird to rebuild the indexes and makes things quick again.
This is sample output - yours may be different.
-1

find ~/.thunderbird/*.default/ -name *.msf | sed 's/ /\\ /g' | xargs rm {} \;

allrightname · 2010-06-04 12:35:24 6
delete duplicate files
This is sample output - yours may be different.
-1

fdupes -rdN $folder

markussesser · 2011-06-03 06:24:02 5
Convert a PKCS#8 private key to PEM format
This is sample output - yours may be different.
-1

openssl pkcs8 -inform DER -nocrypt -in [priv key] -out [pem priv key]

wwest4 · 2009-02-05 16:52:34 20
Get your external IP address with the best commandlinefu.com command

This command uses the top voted "Get your external IP" command from commandlinefu.com to get your external IP address. Use this and you will always be using the communities favourite command. This is a tongue-in-cheek entry and not recommended for actual usage.
This is sample output - yours may be different.
-1

eval $(curl -s http://www.commandlinefu.com/commands/matching/external/ZXh0ZXJuYWw=/sort-by-votes/plaintext|sed -n '/^# Get your external IP address$/{n;p;q}')

jgc · 2009-11-04 16:58:31 6
Identify a PKCS#8 Private Key

a pkcs8 key will have integer 00 at offset 4 and an rsaEncryption object at offset 9
This is sample output - yours may be different.
-1

openssl ans1parse -inform DER < [priv key]

wwest4 · 2009-02-05 16:54:19 18
Remap "New Folder" to Command+N, "New Finder Window" to Cmd+Shift+N in Mac OS X

In Mac OS 9, the "New Folder" keyboard shortcut was Command+N, but in Mac OS X this was changed to "New Finder Window" instead, with "New Folder" taking the more awkward shortcut of Command+Shift+N. This command reverses their mappings.
This is sample output - yours may be different.
-1

defaults write com.apple.finder NSUserKeyEquivalents -dict 'New Finder Window' '@$N' 'New Folder' '@N'; killall Finder

Vulpine · 2009-02-17 23:20:53 7
perl find and replace
This is sample output - yours may be different.
-1

find -name ".php" -exec perl -pi -e 's/search/replace/g/' {} \;

unixmonkey8504 · 2010-03-02 14:18:44 3
Push each of your local git branches to the remote repository
This is sample output - yours may be different.
-1

git push origin --all

JustinCampbell · 2011-06-03 17:55:53 5
Remove annotation- (or other own-lined) tags from an XML document

Removes all lines between the lines containing "" and "", including these lines itself Backdrop: Sometimes when working with XML files without an graphical editor, large comment-/annotation-blocks taper the readability to walk through the file. I like to create a copy of such documents without these annotations. As the documentation itself is in documentation tags inside the annotation tags an therefore graphical editors tend to put the annotation tags in their own lines, this command removes all documentations within annotation-tags. Show Sample Output
This is sample output - yours may be different.
```
transforms:

<xsd:attribute name="version" type="xsd:string" use="required" fixed="1.0">
    <xsd:annotation>
        <xsd:documentation>This attribute denotes the version number ot the utilized XML-schema.</xsd:documentation>
    </xsd:annotation>
</xsd:attribute>

into:

<xsd:attribute name="version" type="xsd:string" use="required" fixed="1.0">
</xsd:attribute>
```
-1

awk "/<xsd:annotation>/{h=1};!h;/<\/xsd:annotation>/{h=0}" annotatedSchema.xsd

2chg · 2011-07-15 07:17:17 7
Find default gateway

Find your default gateway and print it directly output. http://www.bayner.com/ kerim@bayner.com Show Sample Output
This is sample output - yours may be different.
```
192.168.1.1
```
-1

ip route show | awk '$3 ~ /^[1-9]+/ {print $3;}'

kerim · 2010-08-08 23:57:23 3
Do one ping to a URL, I use this in a MRTG gauge graph to monitor connectivity

Does one ping to a URL or host, and echo out just the response time. I use this on, with MRTG to monitor the connections to various hosts. Show Sample Output
This is sample output - yours may be different.
```
12.304
```
-1

ping -c 1 www.google.com | /usr/bin/awk '{print $7}' | /usr/bin/awk 'NR > 1' | /usr/bin/awk 'NR < 2' | /usr/bin/awk -F"=" '{print $2}'

ackers · 2010-12-15 08:50:52 4
Count messages in mcabber history for each JID
This is sample output - yours may be different.
-1

for f in ~/.mcabber/histo/*; do a=`egrep "^(MR|MS)" $f | wc -l`; echo $f: $a | awk -F\/ '{print $6}'; done

aluminiumgeek · 2011-06-04 10:51:49 3
extend KVM image size
This is sample output - yours may be different.
-1

dd bs=1 if=/dev/zero of=/path/to/imagename.raw seek=50G count=1 conv=notrunc

altern · 2011-07-15 09:54:26 3
rename all images in folder with original date time from exif data

for filename multilingual (ex.japanese, chinese, ...etc)
This is sample output - yours may be different.
-1

c=1; for i in *; do identify -verbose $i | perl -ane 'if(/exif:DateTimeOriginal:/){print "@F[1,2] "}'; ls -i $i; done | sort | perl -ane 'print "@F[2]\n"' | while read j; do find -inum $j | xargs -iX cp X NEW_`printf %02d $c`.jpg; cnt=`expr $c + 1`; done

huzioka · 2015-09-22 19:06:43 11
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Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Count occurrences per minute in a log file

The cut should match the relevant timestamp part of the logfile, the uniq will count the number of occurrences during this time interval.

Insert the last argument of the previous command

for example if you did a: $ ls -la /bin/ls then $ ls !$ is equivalent to doing a $ ls /bin/ls

Remove duplicate rows of an un-sorted file based on a single column

The command (above) will remove any duplicate rows based on the FIRST column of data in an un-sorted file. The '$1' represents a positional parameter. You can change both instances of '$1' in the command to remove duplicates based on a different column, for instance, the third: $ awk '{ if ($3 in stored_lines) x=1; else print; stored_lines[$3]=1 }' infile.txt > outfile.txt Or you can change it to '$0' to base the removal on the whole row: $ awk '{ if ($0 in stored_lines) x=1; else print; stored_lines[$0]=1 }' infile.txt > outfile.txt ** Note: I wouldn't use this on a MASSIVE file, unless you're RAM-rich ;) **

Rename files in batch

Quick and dirty convert to flash

This converts any media ffmpeg handles to flash. It would actually convert anything to anything, it's based on the file extension. It doesn't do ANY quality control, sizing, etc, it just does what it thinks is best. I needed an flv for testing, and this spits one out easily.

redirect stdout and stderr each to separate files and print both to the screen

Simultaneously running different Firefox profiles

After running $ firefox -ProfileManager and creating several different profiles, use this command to run multiple Firefox profiles simultaneously.

Show GCC-generated optimization commands when using the "-march=native" or "-mtune=native" switches for compilation.

You can tell GCC to automatically select optimization commands and produce optimized code for the local machine (the one compiling the code), but you can't normally see what switches have been selected and used unless you append a "-v" and pause compilation.

Finding files with different extensions

This is the way how you can find header and cpp files in the same time.

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