Sed and awk common command examples

process file line processing for a row of sed loops
sed-n '/abc/p ' file will print the contents of the mode space by default
line matches the ABC print out-R supports extended delimiters
- N does not let the default print mode space
sed [email protected] sed ' s/abc/def ' file after remote login to modify the contents of file
sed-n ' 5p ' file prints the fifth line
sed-n ' $p ' file prints the last line
sed-n ' 1,3p ' file print one to three lines
sed-n ' 1,~3p ' file prints three lines from the first line
sed-i ' 3i aaaaaaa ' file in front of the third row plus aaaaaaa
sed-i ' $a aaaaa ' file joins AAAAA on the last line
sed-i '/^tom/i aaaaaa ' file adds aaaaaa to the line preceded by Tom
sed-i ' s/abc/def/' file change the first ABC of each line into Def
sed-i ' s/abc/def/g ' file change all ABC into def for each line
sed-i ' s/abc/def/3 ' file change the third ABC of each line into Def
sed-i ' 1,2s/abc/def/' file change one to two lines ABC into def
s swap matching fields C for matching rows
sed-i ' 1,2s/^.*$/def/' file change one to two lines into Def
sed-i ' 4c aaaaaaaaa ' file changes the fourth line to AAAAAAAA
sed-i '/^selinux/c selinux ' changes all rows starting with SELinux to SELinux
sed-i ' 4d ' to remove line fourth
sed-i '/^tom/d ' file delete all lines starting with Tom
sed-i '/^$/d ' file to delete empty lines
sed-i '/^\s$/d ' file delete starts with a blank line \s represents a space or tab
sed-i '/^abc/s/tom/jerry/' file first finds the line that starts with ABC change Tom to Jerry
sed-i '/^mike/s/^/# ' file notes the Mike line
sed-n ' 1p; 3p ' file prints first and third lines
sed-i-E ' 1s/jerry/tom/; -e 3s/mike/xyz/' file multiple strips are executed with-e
The sed-i '/abc/,/^def/s/123/456/' file changes the line between lines starting with ABC and the line of Def to 456
sed-n ' 1,/def/p ' file is printed from the first line until it touches the Def line
#------------------------------------------------------------------------
awk Line-by-row field Loop command
The default is to print the entire line by default with a space as a separator $0-f the separator
awk ' begin{print ' aaaa "}/tom/{print $2}end{print" bbbbbbb "} ' file1first, execute the statement in begin to read from the file whether the first row matches/tom if there is no execution will not be executed until after reading, then run End statement can choose the begin match the ENG.
awk '/^mike/{print} ' file
awk ' nr==2{print ' file NR is the number of line number NF fields
awk ' nr==2| | Nr==4{print "file reads only two fixed line numbers
awk ' {print $} ' file $ entire row
awk ' bengin{fs= ': "ofs=" "}/bash$/{print $} ' file FS specifies a delimiter: OFS specifies the field delimiter for the output
TR ":" "" to change a colon to a space
awk ' begin{i=10;echo$i} '
awk-v v1= $a-v v2= $b ' begin{print v1+v2} ' to pass Bash's value to awk
awk-f:-v v1= $a ' $0~v1 ' {print $} ~ Match Condition
awk ' begin{i=0;} {i++} End{print i} ' file
awk '/^root/{$3+=10;print $} ' file
awk ' $1~ ' root ' {print '} ' file
awk ' $1==500{print $ ' file first field is
awk ' $NF ~ "bash" {print $} ' file last field has bash
awk ' $3>=500&&$3<=503{print} ' file
awk-f:-v v1= $a ' $1~^v1 ' file prints a line beginning with variable a
awk-f: ' {if ($1~/^root/) print '} ' file prints the first field of the first field that begins with the root of the row
awk ' System ("Useradd") ' File System ' () ' command ' called

Sed and awk common command examples