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HOME
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Cursur to start of line
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END
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Cursur to end of line
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TAB
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Autocompletion
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!!
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Repeat last Bash cmd
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cd foldername
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change director to foldername
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cd ..
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go up one folder
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ls
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list services- shows files in current directory
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man <cmd>
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shows manual for <cmd>
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clear
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clears terminal
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reset
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resets terminal but doesn't restart service
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CTRL-Z
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Stops current running function
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CTRL-J
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Same as RETURN
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DEL
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deletes backward from pointer
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exit
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logs out of current session
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cat 'filename'
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prints file to std out on terminal
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pwd
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print working directory
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wc 'filename'
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word count of filename
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echo 'string or filename'
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prints string or filename on the terminal
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cat > 'filename'
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takes standard input into file
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head 'filename'
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prints first 10 lines of file
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tail 'filename'
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prints last 10 lines of file
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cut -b
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specific bytes
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cut -b 1,2,3
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bytes 1 2 and 3
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cut -b 1-3,5-7
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bytes 1-3 and 5-7
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cut -b 1-
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from first byte to end of line
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cut -d
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use a delimiter
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cut -d " "
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outputs from beginning of line to first space
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gcc 'filename.c'
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C files
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chmod +x 'filename.sh'
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Bash script files
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g++ 'filename.cpp'
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CPP files
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javac 'javafile'
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JAVA
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python 'filename'
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to run python scripts
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gcc -o newname 'filename.c'
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change name of compiled program
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g++ -o newname 'filename.cpp'
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change name of compiled program
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grep 'string' </dir/filename.log>
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outputs all lines that match 'string'
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grep 'string' filename1 filename2
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output all lines that match 'string' in multiple files
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grep -i 'string' filenmae
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ignores case
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grep [-options] 'string'
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grep standard output
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grep [-options] 'string' filename
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grep the contents of a file
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grep -A n 'string' filename
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displays n lines after string
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grep -B n 'string' filename
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displays n lines before string
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grep -v 'string' filename
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returns all lines which don't match 'string'
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grep -E
|
allows extended regular expressions
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grep -E 'string{n}'
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get lines with n number of string in it
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grep -c
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count results
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grep -n
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show line number
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grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' 'filename'
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Ip address
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grep -srhw "[[:alnum:]]\+@[[:alnum:]]\+" 'filename'
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email address
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grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' 'filename'
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Ip address
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grep -srhw "[[:alnum:]]\+@[[:alnum:]]\+" 'filename'
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email address
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cmdX||cmdY
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run cmdX if it fails then run cmdY
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cmdX && cmdY
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run cmdX if it doesn't fail run cmdY
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cmd &
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will push cmd to background
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cmd & >/dev/null &
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will put cmd to background and not display cmd outputs
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disown
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typed after pushing cmd to background to disown cmd from current terminal
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jobs
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show disowned jobs
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sed G
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double space a file
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sed 'G;G'
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triple space a file
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sed -n '$='
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count lines
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sed = filename | sed 'N; s/^/ /; s/ *\(.\{6,\}\)\n/\1 /'
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number each line of a file
|
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sed 's/^[ \t]//;s/[ \t]$//'
|
delete both leading and trailing whitespace
|
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sed 's/[ \t]*$//'
|
delete trailing whitespace
|
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sed '/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/.//'
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reverse all characters on the line
|
|
sed 10q
|
print first 10 lines of file
|
|
sed q
|
print first line of file
|
|
sed -e :a -e '$q;N;11,$D;ba'
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Last 10 lines of file
|
|
sed -n '/regexp/p'
|
print only line that matches regex
|
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sed -n '8,12p'
|
print lines 8-12
|
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sed '1,10d'
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delete first 10 lines of a file
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|
.
|
Matches any single character
|
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\d
|
number in 0-9
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\D
|
non number
|
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\w
|
"word" letters, digits and _
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\W
|
non word
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\r
|
return
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\n
|
newline
|
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\s
|
whitespace
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\S
|
non whitespace
|
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'term'*
|
0 or more repetitions of term
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'term'+
|
1 or more repetitions of term
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'term'?
|
0 or one instances of term
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'term'{n}
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exactly n instances of term
|
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'term'{n,}
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atleast n instances of term
|
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'term'{x,n}
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between x and n instances of term
|
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(term1|term2)
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term1 or term2
|
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[0-9]
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matches any number
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[a-z]
|
matches any letter
|
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[aeiou]
|
matches vowels
|
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([A-Za-z0-9-]+)
|
letters numbers and hyphens
|
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(\d{1,2}\/\d{1,2}\/\d{4})
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European Date (eg. 21/3/2018 )
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(\w+@[a-zA-Z_]+?\.[a-zA-Z]{2,6})
|
email addresses
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> 'file'
|
create file or overwrite if existing
|
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>> 'file'
|
append to the file
|
|
< 'file'
|
read from file
|
|
X|Y
|
pipe X as input to Y
|
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./a.out
|
for recently compiled program
|
|
./'script.sh'
|
bash script
|
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./'compiledname'
|
name changed compiled program
|
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'name of installed program'
|
eg. gedit, nano, vim
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