grep

(global search regular expression [RE] and print out the line)
regular expression search and a global print lines

Find the line that contains the string "text" in the file

grep text local_file
grep "text" local_file #另一种方式
grep "text" local_file1 local_file2 ...  #查找多个文件

Find in Files not line containing the string "text" of

grep -v "text" local_file

Ignore case

grep -i "TeXt" local_file
grep -y "TeXt" local_file

No error messages , commonly used in the script file

grep -s "text" local_file

Print out only the matched character string

grep -o "text" local_file

Statistics document the number of lines that contain the string you want to find

grep -c "text" local_file

Does not output information , failure command runs successfully returns 0 returns non-zero, for determining

grep -q "text" local_file

Matching a plurality of strings, or equivalent logic

grep -e "text1" -e "text2" local_file

Recursive search for files multi-level directory

grep -r "text" . #在当前目录下进行查找

Output matching the search string and the line before the line

grep "text" -B 3 local_file #输出之前的3行

Output matching the search string and line after line

grep "text" -A 3 local_file #输出之后的3行

and

Stream editor for editing one or more files, the file operation is repeated simplified. Operating in the buffer zone, unless otherwise specified, the file itself does not modify the content.

`-i`

To modify the file itself

`-q`

After printing out the exit line 2sed

sed '2q' local_file

Seek

Find rows 2-5

sed '2,5p' local_file
sed -n '2,5p' local_file #并打印行号

Find the line in the row that contains the string "text" and contains the string "file" line range

sed '/text/,/file/p' local_file

Find all the way to the line between the string "text" at the beginning of the line starting at line 2

sed '2,/^text/p' local_file

Add to

Add the string "text" in the second line after the line

sed '2a text' local_file

Add the string "text" in the second line of the previous line

sed '2i text' local_file

In front of each word plus the character "a":

sed 's/\w\+/a&/g'  # \w\+匹配每一个单词 &对应之前匹配的每一个单词

replace

Replacement string fileisfiles

sed 's/file/files/g' local_file #打印到控制台，不修改文件
sed 's:file:file:g' local_file # /标记可以使用其他符号代替
sed -i 's/file/files/g' local_file #修改文件本身内容，不打印到控制台

Replace 2-5 behavior string "text"

sed '2,5c text' local_file

delete

Line 2-5 in the deleted file

sed '/2,5/d' local_file

Delete the beginning of string "text" line

sed '/^text.*//g' local_file
sed '/^text/'d local_file

Delete the last line

sed '$d' local_file

Delete blank lines

sed '/^$/d' local_file

awk

Second and third print column data for each row

awk '{print $2,$3}' local_file

Linux command -grep, sed, awk