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Update README.md

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onceupon 2017-03-29 17:54:35 +08:00 committed by GitHub
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@ -419,21 +419,14 @@ fileB 5 2 e
e.g. e.g.
fileA: fileA:
1 0 1 0
2 1 2 1
3 1 3 1
4 0 4 0
fileB: fileB:
1 0 1 0
2 1 2 1
3 0 3 0
4 1 4 1
```bash ```bash
@ -441,11 +434,8 @@ awk -v OFS='\t' 'NR=FNR{a[$1]=$2;next} NF {print $1,((a[$1]=$2)? $2:"0")}' fileA
``` ```
1 0 1 0
2 1 2 1
3 0 3 0
4 0 4 0
##### round all numbers of file (e.g. 2 significant figure) ##### round all numbers of file (e.g. 2 significant figure)
@ -470,11 +460,8 @@ e.g.
seperate seperate
David cat,dog David cat,dog
into into
David cat David cat
David dog David dog
detail here:　http://stackoverflow.com/questions/33408762/bash-turning-single-comma-separated-column-into-multi-line-string detail here:　http://stackoverflow.com/questions/33408762/bash-turning-single-comma-separated-column-into-multi-line-string
@ -745,21 +732,13 @@ for i in $(ls); do echo file $i;done
wget -r -l1 -H -t1 -nd -N -np -A mp3 -e robots=off http://example.com wget -r -l1 -H -t1 -nd -N -np -A mp3 -e robots=off http://example.com
``` ```
//-r: recursive and download all links on page //-r: recursive and download all links on page
//-l1: only one level link //-l1: only one level link
//-H: span host, visit other hosts //-H: span host, visit other hosts
//-t1: numbers of retries //-t1: numbers of retries
//-nd: don't make new directories, download to here //-nd: don't make new directories, download to here
//-N: turn on timestamp //-N: turn on timestamp
//-nd: no parent //-nd: no parent
//-A: type (seperate by ,) //-A: type (seperate by ,)
//-e robots=off: ignore the robots.txt file which stop wget from crashing the site, sorry example.com //-e robots=off: ignore the robots.txt file which stop wget from crashing the site, sorry example.com
@ -1295,13 +1274,9 @@ head -c 50 file
##### group/combine rows into one row ##### group/combine rows into one row
e.g. e.g.
AAAA AAAA
BBBB BBBB
CCCC CCCC
DDDD DDDD
```bash ```bash
cat filename|paste - - cat filename|paste - -