Memorandum of sed

A memorandum for when you want to replace data in bulk using sed. Will be added at any time.

Delete

First, when you want to delete even and odd lines respectively. As a preparation, prepare a file that outputs different character strings on even and odd lines.

$ for i in {1..10}; do
if [ $(($i % 2)) = 0 ]; then
echo 'Even lines'
else
echo 'Odd line'
fi
done > number.txt

$ cat number.txt
Odd line
Even lines
Odd line
Even lines
Odd line
Even lines
Odd line
Even lines
Odd line
Even lines

I want to delete even rows

$ sed -i -e 'n; d' number.txt
$ cat number.txt
Odd line
Odd line
Odd line
Odd line
Odd line

I want to delete odd rows

$ sed -i -e '1d; n; d' number.txt
$ cat number.txt
Even lines
Even lines
Even lines
Even lines
Even lines

Replacement

I want to replace a specific character string with a character string containing spaces at once

All I had to do was escape the space.

#Preparation
$ pen='this is a pen.\n'
$ printf $pen"%.s" {1..10} > pen.txt
$ cat pen.txt
this is a pen.
this is a pen.
this is a pen.
this is a pen.
this is a pen.
this is a pen.
this is a pen.
this is a pen.
this is a pen.
this is a pen.

#Replacement
$ sed -i -e "s/this is a pen./This\ is\ a\ pen\./g" pen.txt
$ cat pen.txt
This is a pen.
This is a pen.
This is a pen.
This is a pen.
This is a pen.
This is a pen.
This is a pen.
This is a pen.
This is a pen.

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