sed 's/unix/linux/' file.txt
| Replacing or substituting string |
sed 's/unix/linux/2' file.txt
| Replacing the nth occurrence of a pattern in a line |
sed 's/unix/linux/g' file.txt
| Replacing all the occurrence of the pattern in a line |
sed 's/unix/linux/3g' file.txt
| Replacing from nth occurrence to all occurrences in a line |
sed 's_http://_www_' file.txt
| Changing the slash (/ -> _) delimiter |
sed 's/unix/{&}/' file.txt
| Using & as the matched string ( adding curly braises ) |
sed 's/(unix)/11/' file.txt
| Replace the word “unix” in a line with twice as the word like “unixunix” |
sed 's/(unix)(linux)/21/' file.txt
| Switch the words “unixlinux” as “linuxunix” |
sed 's/^(.)(.)(.)/321/' file.txt
| Switching the first three characters in a line |
sed 's/unix/linux/p' file.txt
| Duplicating the replaced line with /p flag |
sed -n 's/unix/linux/p' file.txt
| Printing only the replaced lines |
sed 's/unix/linux/' file.txt | sed 's/os/system/'
| Run multiple sed commands by piping the output of one sed command as input to another sed command |
sed -e 's/unix/linux/' -e 's/os/system/' file.txt
| To run multiple sed commands in a single sed command |
sed '3 s/unix/linux/' file.txt
| Replacing string on a specific line number |
sed '1,3 s/unix/linux/' file.txt
| Replacing string on a range of lines |
sed '2,$ s/unix/linux/' file.txt
| Replacing the text from second line to last line in the file |
sed '/linux/ s/unix/centos/' file.txt
| Replace on a lines which matches a pattern. Here the sed command first looks for the lines which has the pattern “linux” and then replaces the word “unix” with “centos” |
sed '2 d' file.txt
| Deleting lines |
sed 'p' file.txt
| Duplicating lines |
sed -n '/unix/ p' file.txt
| Sed as grep command |
sed '/unix/ a "Add a new line"' file.txt
| Add a line after a match |
sed '/unix/ i "Add a new line"' file.txt
| Add a line before a match |
sed '/unix/ c "Change line"' file.txt
| Change a line |
sed 'y/ul/UL/' file.txt
| Transform like tr command |
sed 's/\bthe\b/this/'
| Transform the first occurrence of the word 'the' with 'this' in each line |
sed 's/\bthy\b/your/Ig'
| Case Insensitive transform all the occurrences of the word 'thy' with 'your' |
sed 's/thy/{&}/Ig'
| Case Insensitive. Highlight all the occurrences of 'thy' by wrapping them up in brace brackets |
sed 's/\(\d\{4\}\s\)\{2\}\(\d\{4\}\)/**** **** ****/g'
| Replace occurrences of credit card numbers in the format XXXX XXXX XXXX with a masked version **** **** **** in each line |
sed -E 's/([0-9]+) ([0-9]+) ([0-9]+) ([0-9]+)/\4 \3 \2 \1/'
| Rearranges these groups in reverse order, separated by whitespace, effectively reversing the order of the groups of digits in each line |
sed 's/hack/back/3' file.txt
| Substitute every 3rd occurrence of the word 'hack' to 'back' on every line |
sed '3,4 s/hack/back/3' file.txt
| Substitute every 3rd occurrence of the word 'hack' to 'back' on 3rd and 4th line |
sed 's/ */:/g' sed1.txt
| Formatting the trailing spaces in sed1.txt with a colon(:) |
sed 's/\(^\b[[:alpha:] ]*\)\([[:digit:]]*\)/\=\> \1\[\2\]/g' file.txt
| Making every line to start with a bullet point and enclose the digits in square brackets using regex |
sed -e 's/[[:digit:]]//g' -e 's/ *//'g sed2.txt
| Remove all digits and replace trailing spaces into a single space |