sed command review

sed –n '/sentimental/p' filex

Prints to the screen all lines containing sentimental.

The file filex does not change. Without the –n option, all lines with sentimental will be printed twice.

sed '1,3d' filex > newfilex

Deletes lines 1, 2, and 3 from filex and saves changes in newfilex.

sed '/[Dd]aniel/d' filex

Deletes lines containing Daniel or daniel.

sed –n '15,20p' filex

Prints only lines 15 through 20.

sed '1,10s/Montana/MT/g' filex

Substitutes Montana with MT globally in lines 1 through 10.

sed '/March/!d' filex (csh)
sed '/March/!d' filex (sh)

Deletes all lines not containing March. (The backslash is used only in the csh to escape the history character.)

sed '/report/s/5/8/' filex

Changes the first occurrence of 5 to 8 on all lines containing report.

sed 's/....//' filex

Deletes the first four characters of each line.

sed 's/...$//' filex

Deletes the last three characters of each line.

sed '/east/,/west/s/North/South/' filex

For any lines falling in the range from east to west, substitutes North with South.

sed –n '/Time off/w timefile' filex

Writes all lines containing Time off to the file timefile.

sed 's/([Oo]ccur)ence/1rence/' file

Substitutes either Occurence or occurence with Occurrence or occurrence.

sed –n 'l' filex

Prints all lines showing nonprinting characters as nn, where nn is the octal value of the character, and showing tabs as >.