sed_notes
This is an old revision of the document!
Table of Contents
replace text between two lines with a file
Replace lines between \$start and \$end in main.txt with contents of part.txt
sed -e "$start e cat part.txt" -e "$start,$end d" main.txt
Sample command:
sed -e "1 e cat part.txt" -e "1,2 d" main.txt
$ cat main.txt a b c d e f g h i j k l $ cat part.txt x y z p q r s t u $ start=1; end=2; sed -e "$start e cat part.txt" -e "$start,$end d" main.txt x y z p q r s t u g h i j k l $ start=2; end=4; sed -e "$start e cat part.txt" -e "$start,$end d" main.txt a b c x y z p q r s t u $ start=2; end=3; sed -e "$start e cat part.txt" -e "$start,$end d" main.txt a b c x y z p q r s t u j k l $ start=2; end=2; sed -e "$start e cat part.txt" -e "$start,$end d" main.txt a b c x y z p q r s t u g h i j k l
insert file at the beginning of another file
This will insert part.txt at the beginning of main.txt.
sed -e "1 e cat part.txt" main.txt
Example:
$ cat main.txt a b c d e f g h i j k l $ cat part.txt x y z p q r s t u $ sed -e "1 e cat part.txt" main.txt x y z p q r s t u a b c d e f g h i j k l
backup with timestamp
tags | sed create backup, YYYYMMDD_HHMMSS
sed "-i_asof_`date +%Y%m%d_%H%M%S`" -e 's/foo/bar/g' main.txt
will backup to something like main.txt_asof_20210128_151656
sed "-i.`date +%F`" -e 's/foo/bar/g' main.txt
will backup to something like main.txt.2021-01-28
sed do not change line endings
replace double quote with single quote
sed "s/\"/'/g"
Ref:- https://stackoverflow.com/questions/16154007/replace-all-double-quotes-with-single-quotes
Sample run:
% sed "s/\"/'/g" a a " ' ' '
sed_notes.1611870458.txt.gz · Last modified: 2021/01/28 21:47 by raju