A new day is coming,whether we like it or not. The question is will you control it,or will it control you?

awk 'BEGIN{print "START"}; {print}; END{print "END"}'

sed -e $'1i\\\nSTART' -e $'$a\\\nEND'

content-generator |
{ echo START; cat; echo END; } |
postprocessor

#head打印第一行，tail生成其他行来排序
head -n 1 table.txt && tail -n +2 table.txt | sort -nr -k1
#首先将第一行存储到一个变量中
foo=$(head -n 1 table); echo -e "$foo"; tail -n +2 table | sort -nr -k1

foo=$(head -n 1 table); echo -e "Record\t$foo"; tail -n +2 table | nl | sed 's/^[ ]*//'

awk 'NR!=1'
awk 'NR>1'
tail -n +2
sed '1d'

echo M{1..2016}; cat text.txt

awk '{$3=NR==1?"add" OFS $3:"hope" OFS $3} 1' OFS="\t\t" text.txt

cat mainfile.txt
file1	abc	def	xyz
file1	aaa	pqr	xyz
file2	lmn	ghi	xyz
file2	bbb	tuv	xyz
#单纯的按照第一列分隔文件
awk '{FILENAME=$1; print >>FILENAME}' mainfile.txt
awk -F '\t' '{if(FILENAME!=$1){FILENAME=$1;print "Name \t State \t Country" > FILENAME}} {print $2 "\t" $3 "\t" $4 > FILENAME}'  mainfile.txt
cat file1
Name	 State	Country
abc	 def	        xyz
aaa	 pqr 	        xyz
cat file2
Name	 State	Country
lmn	 ghi	        xyz    
bbb	 tuv	        xyz

ggplot(data = <DATA>) +    #生成一个空的图
  <GEOM_FUNCTION>(mapping = aes(<MAPPINGS>))  #增加一个图层，其中涉及参数仅用于这一图层

ggplot(data = mpg, mapping = aes(x = displ, y = hwy)) + 
  geom_point(mapping = aes(color = class)) + 
  geom_smooth(data = dplyr::filter(mpg, class == "subcompact"), se = FALSE) ##se为是否展示置信区间

git clone https://github.com/vim/vim.git

#以管理员权限运行cmd，进入bundle文件夹下
cd Vim/vimfiles/bundle
$ git clone https://github.com/VundleVim/Vundle.vim.git Vundle.vim

filetype off

" Vundle的路径
set rtp+=$VIM/vimfiles/bundle/Vundle.vim
" 插件的安装路径
call vundle#begin('$VIM/vimfiles/bundle/')
" 需要安装的插件
Plugin 'gmarik/Vundle.vim'
Plugin 'L9'
 
call vundle#end()
filetype plugin indent on

:BundleInstall    安装插件
:PluginInstall    安装插件
:BundleInstall!   更新插件
:BundleClean(!)   卸载不在.vimrc配置列表中的插件
:BundleSearch(!)  搜索插件
:BundleList       显示已安装插件列表

cat test.txt
12  AT  CG
7555  AAA       AT
878 GGGG        CTG
cat test.txt | awk 'BEGIN{FS=OFS="\t"} {for(i=1;i<=NF;i++) if ($i~/^[ATCG]{2}$/) print $i}'

cat test.txt | awk --re-interval 'BEGIN{FS=OFS="\t"} {for(i=1;i<=NF;i++) if ($i~/^[ATCG]{2}$/) print $i}'
AT
CG
AT

$ awk -va=1 '{print $1,$1+a}' log.txt
 ---------------------------------------------
 2 3
 3 4
 This's 1
 10 11
 $ awk -va=1 -vb=s '{print $1,$1+a,$1b}' log.txt
 ---------------------------------------------
 2 3 2s
 3 4 3s
 This's 1 This'ss
 10 11 10s

 echo "123356" | awk '{print gensub("3","d",2)}'
123d56

[zpxu@node102 ~]$  cat 2.txt 1.txt 
I0011  11111    hhh
I0012  22222    kkk
I0014  55555    ppp
I0017  66666    ttt
0011AAA 200.00 20050321
0012BBB 300.00 20050621
0013DDD 400.00 20050622
0014FFF 500.00 20050401
#比较 1.txt的1-4字符 和 2.txt的2-5 字符，如果相同，将2.txt 的全部列 与 1.txt 合并
[zpxu@node102 ~]$ awk  'NR==FNR{a[substr($1,2,5)]=$0}NR>FNR&&a[b=substr($1,1,4)]{print $0, a[b]}' 2.txt 1.txt 
0011AAA 200.00 20050321 I0011  11111    hhh
0012BBB 300.00 20050621 I0012  22222    kkk
0014FFF 500.00 20050401 I0014  55555    ppp
#NR==FNR处理的是2.txt文件,NR>FNR处理的是1.txt文件
#awk 'NR==FNR{a[$1]=$2}NR>FNR&&a[$1] {print $1,a[$1]}' 2.txt 1.txt

[zpxu@node102 ~]$  cat data 
name naughty
25 shandong
age 14  
ah,here is test
[zpxu@node102 ~]$ awk '{if(NR==1){next} print $1,$2}' data   
25 shandong
age 14
ah,here is

cat data
web01[192.168.2.100]
httpd            ok
tomcat               ok
sendmail               ok
web02[192.168.2.101]
httpd            ok
postfix               ok
web03[192.168.2.102]
mysqld            ok
httpd               ok
awk '/^web/{T=$0;next;} {print T":\t"$0;}' data
web01[192.168.2.100]:   httpd            ok
web01[192.168.2.100]:   tomcat               ok
web01[192.168.2.100]:   sendmail               ok
web02[192.168.2.101]:   httpd            ok
web02[192.168.2.101]:   postfix               ok
web03[192.168.2.102]:   mysqld            ok
web03[192.168.2.102]:   httpd               ok
#行首匹配到web时将这一整行赋值给T存储起来，并读入下一行，最后将T和下一行一起print；

[zpxu@node102 ~]$ cat d  
$1=="name"{print $0;getline;print $0;}  
$1=="age"{print $0}  
[zpxu@node102 ~]$ awk -f d data   
name naughty  
25 shandong  
age 14

[zpxu@node102 ~]$  cat 1.txt 
1
2
3
4
5
6
7
8
9
10
11
12
[zpxu@node102 ~]$ awk -vD="1,3,5,8,11" 'BEGIN{split(D,a,",");c=1}NR==a[c]{c++;next}1' 1.txt 
2
4
6
7
9
10
12

[zpxu@node102 ~]$  cat data 
1,2,3,4,5,6,7,8,9,10,11,12
[zpxu@node102 ~]$ awk --re-interval -vD='1,3,5,11' 'BEGIN{l=split(D,a,",")}{for(i=1;i<=l;i++){$0=gensub("(([^,]*,?){"a[i]-i"})([^,]+,?)(.*)","\\1\\4","1")}}1' data 
2,4,6,7,8,9,10,12