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onceupon 2016-06-16 14:44:57 +08:00 committed by GitHub
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README.md
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@ -16,7 +16,10 @@ http://stackoverflow.com/users/4290753/once
- [Awk](#awk) - [Awk](#awk)
- [Xargs](#xargs) - [Xargs](#xargs)
- [Find](#find) - [Find](#find)
- [Loops](#loops)
- [Download](#download)
- [Others](#others) - [Others](#others)
- [System](#system)
##Grep ##Grep
#####extract text bewteen words (e.g. w1,w2) #####extract text bewteen words (e.g. w1,w2)
@ -405,6 +408,56 @@ if no subdirectory
//M for MB, etc //M for MB, etc
##Loops
[[back to top](#handy-bash-oneliner-commands-for-tsv-file-editing)]
#####while loop, column subtraction of a file (e.g. a 3 columns file)
while read a b c; do echo $(($c-$b));done < <(head filename)
//there is a space between the two '<'s
#####while loop, sum up column subtraction
i=0; while read a b c; do ((i+=$c-$b)); echo $i; done < <(head filename)
#####if loop
if (($j==$u+2))
//(( )) use for arithmetic operation
if [[$age >21]]
//[[ ]] use for comparison
#####for loop
for i in $(ls); do echo file $i;done
##Download
[[back to top](#handy-bash-oneliner-commands-for-tsv-file-editing)]
#####download all from a page
wget -r -l1 -H -t1 -nd -N -np -A mp3 -e robots=off http://example.com
//-r: recursive and download all links on page
//-l1: only one level link
//-H: span host, visit other hosts
//-t1: numbers of retries
//-nd: don't make new directories, download to here
//-N: turn on timestamp
//-nd: no parent
//-A: type (seperate by ,)
//-e robots=off: ignore the robots.txt file which stop wget from crashing the site, sorry example.com
##Others ##Others
[[back to top](#handy-bash-oneliner-commands-for-tsv-file-editing)] [[back to top](#handy-bash-oneliner-commands-for-tsv-file-editing)]
#####remove newline / nextline #####remove newline / nextline
@ -483,7 +536,7 @@ or
echo 'hihi' >>filename echo 'hihi' >>filename
#####make BEEP found #####make BEEP sound
speaker-test -t sine -f 1000 -l1 speaker-test -t sine -f 1000 -l1
set beep duration set beep duration
@ -649,6 +702,65 @@ or
file=${1%.*} file=${1%.*}
//remove string after a "." //remove string after a "."
#####search from history
Ctrl+r
#####python simple HTTP Server
python -m SimpleHTTPServer
#####variables
{i/a/,}
e.g. replace all
{i//a/,}
//for variable i, replace all 'a' with a comma
#####read user input
read input
echo $input
#####generate sequence 1-10
seq 10
#####sum up input list (e.g. seq 10)
seq 10|paste -sd+|bc
#####find average of input list/file
i=`wc -l filename|cut -d ' ' -f1`; cat filename| echo "scale=2;(`paste -sd+`)/"$i|bc
#####generate all combination (e.g. 1,2)
echo {1,2}{1,2}
//1 1, 1 2, 2 1, 2 2
#####generate all combination (e.g. A,T,C,G)
set = {A,T,C,G}
group= 5
for ((i=0; i<$group; i++));do
repetition=$set$repetition;done
bash -c "echo "$repetition""
#####read file content to variable
foo=$(<test1)
#####echo size of variable
echo ${#foo}
#####array
declare -A array=()
#####send a directory
scp -r directoryname user@ip:/path/to/send