I'm trying to replace a string in a specific line number using a variable

问题

here's my attempt:

sed -i -e "$chs/|0|/|900|/" users

The variable "chs" has the line number in which I want to replace the string, but it doesn't work, any ideas?

回答1:

If chs contains the line number, say 5, then the following:

sed -i -e "$chs/|0|/|900|/" users

will expand to:

sed -i -e "5/|0|/|900|/" users

As a sed command, that is nonsense. It should return an error message about an unknown command.

You need to create a substitute command preceded by a line number. Try:

sed -i -e "$chs s/|0|/|900|/" users

回答2:

awk to the rescue!

 awk -v n="$chs" 'NR==n{sub(/search/,replace)}1' 

来源：https://stackoverflow.com/questions/33458003/im-trying-to-replace-a-string-in-a-specific-line-number-using-a-variable