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Copy all files. All normal files, all hidden files and all files starting with - (minus).

./* is for copying files starting with - .[!.]* is for copying hidden files and avoiding copying files from the parent directory. ..?* is for copying files starting with .. (avoids the directory ..) /path/to/dir the path to the directory where the files should be copied Can also be used as a script. Input argument is /path/to/dir in tcsh, replace .[!.]* with .[^.]*
This is sample output - yours may be different.
1

cp ./* .[!.]* ..?* /path/to/dir

ako · 2009-03-16 13:27:36 16
Cut out a piece of film from a file. Choose an arbitrary length and starting time.

With: -vcodec, you choose what video codec the new file should be encoded with. Run ffmpeg -formats E to list all available video and audio encoders and file formats. copy, you choose the video encoder that just copies the file. -acodec, you choose what audio codec the new file should be encoded with. copy, you choose the audio encoder that just copies the file. -i originalfile, you provide the filename of the original file to ffmpeg -ss 00:01:30, you choose the starting time on the original file in this case 1 min and 30 seconds into the film -t 0:0:20, you choose the length of the new film newfile, you choose the name of the file created. Here is more information of how to use ffmpeg: http://www.ffmpeg.org/ffmpeg-doc.html
This is sample output - yours may be different.
22

ffmpeg -vcodec copy -acodec copy -i orginalfile -ss 00:01:30 -t 0:0:20 newfile

ako · 2009-03-16 12:58:07 13

iso-8859-1 to utf-8 safe recursive rename

This command is a powerful "detoxifier" that eliminates special chars, spaces and all those little chars we don't like. It support several "sequences" so be sure to check your /usr/local/etc/detoxrc while at it... and maybe define your own Show Sample Output

detox -r -s utf_8 /path/to/old/win/files/dir

renich · 2009-03-16 07:50:36 14

Using awk to sum/count a column of numbers.

Takes a input file (count.txt) that looks like: 1 2 3 4 5 It will add/sum the first column of numbers.
This is sample output - yours may be different.
19

cat count.txt | awk '{ sum+=$1} END {print sum}'

duxklr · 2009-03-16 00:22:13 29
Read a gzipped text file directly with less.

There is no need to 'zcat textfile.gz | less' with newer distros. This is useful for reading archived log files without having to extract, read, and zip when done.
This is sample output - yours may be different.
-5

less textfile.gz

allbad · 2009-03-15 23:51:17 24
Create a P12 file, using OpenSSL
This is sample output - yours may be different.
0

openssl pkcs12 -export -in /dir/CERTIFICATE.pem -inkey /dir/KEY.pem -certfile /dir/CA-cert.pem -name "certName" -out /dir/certName.p12

gadget00 · 2009-03-15 23:14:26 4
View the list of files and directories in an archive with less.

This will print out the files and directories in a gzipped tarball.
This is sample output - yours may be different.
-1

less file.tar.gz

allbad · 2009-03-15 23:00:05 15
Display 6 largest installed RPMs sorted by size (descending)

Low on disk space? Check the largest installed RPMs for delete canditates. Show Sample Output
This is sample output - yours may be different.
```
$ rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs
     1	783535706 ibm-notes-editors
     2	396131310 ibm-notes-notesplugin
     3	354961772 clipart-openclipart
     4	238607804 ibm-notes-framework
     5	136072442 openoffice.org-core
     6	117823438 libboost-devel
```
2

rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs

mpb · 2009-03-15 22:18:17 9
Convert embedded spaces in filenames to "_" (underscore)

This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character. Show Sample Output
This is sample output - yours may be different.
```
$ # before
$ ls -1
big world keeps turning
bye bye
fred
hello world
$ ls -1 | grep " " | awk '{printf("mv \"%s\" ",$0); gsub(/ /,"_",$0); printf("%s\n",$0)}' | sh # rename filenames: spaces to "_"
$ # after
$ ls -1
big_world_keeps_turning
bye_bye
fred
hello_world
```
2

ls -1 | grep " " | awk '{printf("mv \"%s\" ",$0); gsub(/ /,"_",$0); printf("%s\n",$0)}' | sh # rename filenames: spaces to "_"

mpb · 2009-03-15 18:42:43 18
Generate secure password to userwith chpasswd
This is sample output - yours may be different.
0

echo "encryptedpassword"|openssl passwd -1 -stdin

chmouel · 2009-03-15 17:06:50 6
Quickly add user accounts to the system and force a password change on first login

This command is a bit Linux specific, as --stdin doesn't exist for passwd on many Unix machines. Further, useradd is high level in most distributions and Unix derivatives except for the Debian family of distros, where adduser would be more appropriate. The last bit, with chage, will force the user to change their password on new login.
This is sample output - yours may be different.
6

for name in larry moe schemp; do useradd $name; echo 'password' | passwd --stdin $name; chage -d 0 $name; done

atoponce · 2009-03-15 12:02:39 19

Display calendar with specific national holidays and week numbers

NB when you run this gcal command in your shell, holidays are highlighted but this highlighting does not show in the sample output (above). To find full details on gcal options: gcal --long-help | less Example for United States, Pennsylvania: gcal -K -q US_PA 2009 # display holidays in USA/Pennsylvania for 2009 (with week numbers) Example for Hong Kong: gcal -K -q HK 2009 # display holidays in Hong Kong for 2009 (with week numbers) Show Sample Output

gcal -K -q GB_EN 2009 # display holidays in UK/England for 2009 (with week numbers)

mpb · 2009-03-15 10:19:52 8

To have only unique lines in a file
This is sample output - yours may be different.
3

sort file1.txt | uniq > file2.txt

rain · 2009-03-14 20:24:06 17
Edit the /etc/sudoers config file the right way.

'visudo' is installed by default on most Unix-like systems. If not installed, you can get it from the 'sudo' package. 'visudo' will use the text editor found in your $EDITOR variable, whether it's vi, vim, emacs, nano or gedit. After making changes to the /etc/sudoers file, visudo will check for syntax errors, and notify you of them. This is better than 'vi /etc/sudoers', because of this capability. Rule #1 of system administration- if there is a tool that exists for editing config files, use the tool.
This is sample output - yours may be different.
1

visudo

atoponce · 2009-03-14 03:39:32 5
Merge *.pdf files

Merge all pdf files in the directory into one pdf file (the out.pdf file)
This is sample output - yours may be different.
13

gs -q -sPAPERSIZE=letter -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=out.pdf `ls *.pdf`

oops66 · 2009-03-13 22:34:14 40
display most recently modified files

Can pipe to tail or change the awk for for file size, groups, users, etc. Show Sample Output
This is sample output - yours may be different.
```
/etc$ ls -l|awk '{print $6,$8}'|sort -d
 
2003-12-04 locale.alias
2006-05-08 jvm
2006-07-10 mtools.conf
...
2009-03-10 resolv.conf
2009-03-11 purple
2009-03-12 gdm
```
-4

ls -l|awk '{print $6,$8}'|sort -d

archlich · 2009-03-13 19:00:18 9

Display kernel profile of currently executing functions in Solaris.

Lockstat will sample the kernel 977 times per second, and print out the functions that it sees executing on the CPU during the sample. The -s 10 switch tells lockstsat to not only print that function, but also show the call stack (up to 10 deep). Show Sample Output

lockstat -I -i 977 -s 30 -h sleep 1 > /tmp/profile.out

garylittle · 2009-03-13 13:17:53 4

package most recent files in project

create tar.bz2 package from files "-type f" modificated today "-mtime -1" in ~/project
This is sample output - yours may be different.
0

find ~/project -mtime -1 -type f -print | tar jcvf myfiles.tar.bz2 -T -

voyeg3r · 2009-03-13 13:03:11 4
rsync + find

rsync from source to dest all between >30
This is sample output - yours may be different.
8

rsync -avz -e ssh --files-from=<(find -mtime +30 -mtime -60) source dest

voyeg3r · 2009-03-13 12:58:28 18
Five Minutes To Go

command to turn off your computer when you go home and can not wait Show Sample Output
This is sample output - yours may be different.
```
5
4
3
2
1
0
bye, bye
```
-14

for i in $(seq 0 5) ; do echo "5 - $i" | bc -l ; sleep 60 ; done && echo "bye, bye" && shutdown -h now

arctarus · 2009-03-13 12:16:35 843
List all file and directory on user's home with details
This is sample output - yours may be different.
-8

ls /home/user | xargs ls -lhR | less

servermanaged · 2009-03-13 10:38:46 16
Nice way to view source code

over works like 'more' or 'less', but it pretty print the source code
This is sample output - yours may be different.
-2

over myscript.sh

haivu · 2009-03-13 06:13:21 13
Remind yourself to leave in 15 minutes

If you spend most of your time in front of the terminal, leave is a useful reminder. Leave can have absolute form: leave 1555 reminds you to leave at 3:55PM Show Sample Output
This is sample output - yours may be different.
```
$ leave +15
Alarm set for Thu Mar 12 23:21. (pid 27264)
```
35

leave +15

haivu · 2009-03-13 06:09:52 15
ls to show hidden file, but not . or ..

This command is almost the same as 'ls -a', but it does not display the current dir (.) or parent (..)
This is sample output - yours may be different.
0

ls -A

haivu · 2009-03-13 05:12:01 20
Use -t when using find and cp

-t, --target-directory=DIRECTORY (copy all SOURCE arguments into DIRECTORY).
This is sample output - yours may be different.
1

find . -name "*.pdf" -print0 | xargs -0 cp -t downloads/

abcde · 2009-03-13 03:15:27 5
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send a circular

Grabs the complete module list from CPAN, pulls the first column, ditches html lines, counts, ditches small namespaces.

Convert video files to XviD

Find a CommandlineFu users average command rating

Get curenttly playing track in Last.fm radio

Wait for file to stop changing

This loop will finish if a file hasn't changed in the last 10 seconds. . It checks the file's modification timestamp against the clock. If 10 seconds have elapsed without any change to the file, then the loop ends. . This script will give a false positive if there's a 10 second delay between updates, e.g. due to network congestion . How does it work? 'date +%s' gives the current time in seconds 'stat -c %Y' gives the file's last modification time in seconds '$(( ))' is bash's way of doing maths '[ X -lt 10 ]' tests the result is Less Than 10 otherwise sleep for 1 second and repeat . Note: Clever as this script is, inotify is smarter.

Remove all unused kernels with apt-get

TIMTOWTDI

Edit 2 or more files in vim using vim -d

Is this not the same

Time conversion/format using the date command

.inputrc keybinding to wrap current line in inotifytools for instant compile/test-as-you-save-loop

Assuming you've written all of make -j hfst-tokenize && echo doavtter gr?dakursa|./hfst-tokenize --gtd tokeniser-gramcheck-gt-desc.pmhfst and want that to execute every time you :w in vim (or C-xC-s in Emacs), just hit and it'll turn into $ while true; do ( make -j hfst-tokenize && e doavtter gr?dakursa|./hfst-tokenize --gtd tokeniser-gramcheck-gt-desc.pmhfst ); inotifywait -q -e modify -e close_write *; done with the cursor right before the ')'. Hit enter, and it'll run on each save. Requires the package inotify-tools installed.

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