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