Date Added: 14/01/2015

ls ,cd , pwd , vi, gedit, cp,mv,rm,pico,touch


cat -n (-n line number)

>> or 2> save to file the output

script and scriptreplay  command  like videoplayer you can record the code uyou write  to terminal.

$ script -t 2> timing.log -a output.session
type commands;


$ scriptreplay timing.log output.session

find  /home/muslum -name "*.php"     finds php files

-iname ignore case sensitive

-path search path

-regex :  $ find . -regex ".*\(\.py\|\.sh\)$"

using more condition:

new.txt some.jpg text.pdf
$ find . \( -name "*.txt" -o -name "*.pdf" \) -print

find by  file ( access time - time, modification time -mtime , change time -ctime )  -ctime +7   means before  7 day ago 

search based on file size

-delete  : deleting matched files

serach based on permission (755) and ownership

$ find . -type f -name "*.php" !-perm 644 -print

$ find . -type f -user slynux -print

exec chown  username {}  changes file owner  change can be done by a mathes

serach  -prune  ignore matches


output  |  tr 'find text' 'replace text'

tr -d delete option

For example:
$ echo "Hello 123 world 456" | tr -d '0-9'

Hello world

tr -s

echo "ddddd 432  ddsa  dd"  | tr -s  'dd '
output :  "d432  dsa  d"

Checksum and Varification

$ md5deep -rl directory_path > directory.md5
# -r to enable recursive traversal
# -l for using relative path. By default it writes absolute file path in
Alternately, use a combination of find to calculate checksums recursively:
$ find directory_path -type f -print0 | xargs -0 md5sum >> directory.md5
To verify, use the following

Cryptographic tool and Hashes

cript ,  gpg,  base64, md5sum, sha1sum, opensslpasswd

Sorting unique and dublicates

commands: sort ,uniq

sorting file content  in alpha,numeric,reverse,merge sorted, and unique
sorting according to key and column

# Sort reverse by column1
$ sort -nrk 1 data.txt
4 linux 1000
3 bsd 1000
2 winxp 4000
1 mac 2000
# -nr means numeric and reverse

spliting file and data

you can spli5t files by matches and based on its content data, extension

split ,csplit


$ csplit server.log /SERVER/ -n 2 -s {*} -f server -b "d.log" ; rm
$ ls
server01.log server02.log server03.log server.log

based on extension

he name from name.extension can be easily extracted using the % operator. You can
extract the name from "sample.jpg" as follows:
echo File name is: $name
The output is:
File name is: sample
The next task is to extract the extension of a file from its filename. The extension can be
extracted using the # operator as follows:
Extract .jpg from the filename stored in the variable file_jpg as follows:
echo Extension is: jpg
The output is:
Extension is: jpg


 Renaming *.JPG to *.jpg:

$ rename *.JPG *.jpg

To replace space in the filenames with the "_" character:
$ rename 's/ /_/g' *
# 's/ /_/g' is the replacement part in the filename and * is the wildcard for the
target files. It can be *.txt or any other wildcard pattern.
To convert any filename of files from uppercase to lowercase and vice versa:
$ rename 'y/A-Z/a-z/' *
$ rename 'y/a-z/A-Z/' *
To recursively move all the .mp3 files to a given directory:
$ find path -type f -name "*.mp3" -exec mv {} target_dir \;
To recursively rename all the files by replacing space with the "_" character:
$ find path -type f -exec rename 's/ /_/g' {} \;

spell check and dictionary manipulation 

grep , look,  aspell list

$ look word filepath
Or alternately, use:
$ grep "^word" filepath

Automating interactive input

Making commands quicker by running parallel processes

Last Update: Posted by: müslüm ÇEN
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