Update README.md

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onceupon 2016-06-14 16:03:32 +08:00 committed by GitHub
parent 17c9f93e06
commit 911bd9bc43

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@ -93,6 +93,7 @@ e.g. add >$i to the first line (to make a FASTA file)
//notice the double quotes! in other examples, you can use a single quote, but here, no way!
//'1i' means insert to first line
delete empty lines
sed '/^\s*$/d'
@ -126,6 +127,7 @@ print every nth lines
sed -n '0~3p' filename
//catch 0: start; 3: step
print every odd # lines
sed -n '1~2p'
@ -139,11 +141,13 @@ remove leading whitespace and tabs
sed -e 's/^[ \t]*//'
//notice a whitespace before '\t'!!
remove only leading whitespace
sed 's/ *//'
//notice a whitespace before '*'!!
remove ending commas
sed 's/,$//g'
@ -231,22 +235,35 @@ fileB 4 1 d
fileB 5 2 e
and gate
e.g.
fileA:
1 0
2 1
3 1
4 0
fileB:
1 0
2 1
3 0
4 1
awk -v OFS='\t' 'NR=FNR{a[$1]=$2;next} NF {print $1,((a[$1]=$2)? $2:"0")}' fileA fileB
1 0
2 1
3 0
4 0
round all numbers of file (e.g. 2 significant figure)
@ -274,6 +291,7 @@ display 3 items per line
//1 2 3
4 5 6
prompt before execution
echo a b c |xargs -p -n 3
@ -284,6 +302,7 @@ print command along with output
///bin/echo abcd
//abcd
with find and rm
find . -name "*.html"|xargs rm -rf
@ -320,6 +339,7 @@ copy all files from A to B
//v: verbose|
//p: keep detail (e.g. owner)
with sed
ls |xargs -n1 -I file sed -i '/^Pos/d' filename
@ -341,6 +361,7 @@ count files within directories
echo mso{1..8}|xargs -n1 bash -c 'echo -n "$1:"; ls -la "$1"| grep -w 74 |wc -l' --
// "--" signals the end of options and display further option processing
download dependencies files and install (e.g. requirements.txt)
cat requirements.txt| xargs -n1 sudo pip install
@ -373,6 +394,7 @@ if no subdirectory
replace "www" "w" -- *
//a space before *
find and output only filename (e.g. "mso")
find mso*/ -name M* -printf "%f\n"
@ -403,17 +425,24 @@ or
sdiff fileA fileB
//side-to-side merge of file differences
>number a file (e.g. fileA)
number a file (e.g. fileA)
nl fileA
or
nl -nrz fileA
//add leading zeros
combine/ paste two files (e.g. fileA, fileB)
paste fileA fileB
//default tab seperated
reverse string
echo 12345| rev
@ -439,11 +468,13 @@ or
(command here) 2>&1 >>outfile
//0: standard input; 1: standard output; 2: standard error
send mail
echo 'heres the content'| mail -A 'file.txt' -s 'mail.subject' me@gmail.com
//use -a flag to set send from (-a "From: some@mail.tld")
.xls to csv
xls2csv filename
@ -501,6 +532,7 @@ or
!c
//run cat filename again
extract .xf
1.unxz filename.tar.xz
@ -548,11 +580,13 @@ or
Alt+Shift+#
//to make it to history
add things to history (e.g. "addmetohistory")
#addmetodistory
//just add a "#" before~~
sleep awhile or wait for a moment or schedule a job
sleep 5;echo hi
@ -569,12 +603,14 @@ backup with rsync
rsync -av --update directory directory.bak
//skip files that are newer on receiver (i prefer this one!)
make all directories at one time!
mkdir -p project/{lib/ext,bin,src,doc/{html,info,pdf},demo/stat}
//-p: make parent directory
//this will create project/doc/html/; project/doc/info; project/lib/ext ,etc
run command only if another command returns zero exit status (well done)
cd tmp/ && tar xvf ~/a.tar
@ -594,17 +630,22 @@ use backslash "\" to break long command
>mkdir -p tmp/a/b/c
get pwd
VAR=$PWD; cd ~; tar xvf -C $VAR file.tar
//PWD need to be capital letter
list file type of file (e.g. /tmp/)
file /tmp/
//tmp/: directory
bash script
#!/bin/bash
file=${1#*.}
//remove string before a "."
file=${1%.*}
//remove string after a "."