追境的笔记

# grep sed awk

# sed

# 命令

先 执行 brew install gnu-sed

  • gsed "2a 88888888888" testfile 在 testfile的第2行后写入hello
  • gsed "2a 88888888888\n999999999" testfile 在 testfile的第2行后写入两行，分别是hello 行和 world行
  • gsed "2i hello" testfile在 testfile的第2行前写入hello
  • gsed "2d" testfile 删除第2行
  • gsed "2,4d" testfile 删除第 [2,4]行
  • gsed "5,+4d" testfile 删除第 [5,9]行
  • gsed "5,$d" testfile 删除第 5行之后的所有
  • gsed "/Runoob/, /Wiki/ d" 删除匹配到Runoob行开始到 ，匹配到Wiki结束
  • gsed "2c hello" testfile把第二行内容替换为hello
  • gsed "s#hello# word#" testfile将内容hello替换为word
  • gsed -n 2p 1.txt 输出文件到第二行
1.txt
aaa
bbb
ccc

x=a


gsed -ie "s#$x#eee#g" 1.txt 把所有a替换为eee
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gsed 正则分组

echo i am caozepeng teacher. | gsed  "s/^.*am \([a-z].*\) tea.*$/\1/g"
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1name copy 2.txt 
2name copy 3.txt
3name copy 4.txt 
4name copy 5.txt
5name copy 6.txt


ls  *copy*.txt  |gsed -r "s#(.*) copy [1-9].*#mv & \1.txt#g"

mv 1name copy 2.txt 1name.txt
mv 2name copy 3.txt 2name.txt
mv 3name copy 4.txt 3name.txt
mv 4name copy 5.txt 4name.txt
mv 5name copy 6.txt 5name.txt
mv 7name copy 2.txt 7name.txt


ls  *copy*.txt  |gsed -r "s#(.*) copy [1-9].*#mv \"&\" \1.txt#g"|bash

mv "1name copy 2.txt" 1name.txt
mv "2name copy 3.txt" 2name.txt
mv "3name copy 4.txt" 3name.txt
mv "4name copy 5.txt" 4name.txt
mv "5name copy 6.txt" 5name.txt
mv "7name copy 2.txt" 7name.txt
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# 备份

1.txt 文件内容是

mv "1name copy 2.txt" 1name.txt
mv "2name copy 3.txt" 2name.txt
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执行 sed -i.brk "s#mv#rename#" 1.txt 后

1.txt变为以下

rename "1name copy 2.txt" 1name.txt
rename "2name copy 3.txt" 2name.txt
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多出一个备份文件1.txt.brk

mv "1name copy 2.txt" 1name.txt
mv "2name copy 3.txt" 2name.txt
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# 复制文件

# awk

ls | awk 'BEGIN{ FS=" ";OFS="," }{ print $1,$2 }'

ls | awk 'BEGIN{ FS=" ";OFS="","; }{ print """$1,$2 }'

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