CODEWITHSUNDEEP
linuxsed
awmusic12635
awmusic12635

Reputation: 1251

Executing Sed Command

When I run the command 

sed -e "s/$1/@root@The-Three-Little-Pigs-Siri-Proxy/" -i gen_certs.sh

I Get the following error. I am trying to replace the text $1 with the other below in the same file, not creating a new one just modifying the current one.

sed: -e expression #1, char 0: no previous regular expression

Any ideas what could be causing the error and how to fix it?

OS: Ubuntu 10.10 32 bit

Upvotes: 3

Views: 1775

Answers (2)

kev
kev

Reputation: 161834

$1 will expand to a null-string('') if it's in double-qouted string.
You can use single quote to keep the literal value of$1:

sed -e 's/$1/@root@The-Three-Little-Pigs-Siri-Proxy/' -i gen_certs.sh

Upvotes: 3

Alexander Pavlov
Alexander Pavlov

Reputation: 32296

You need to escape the pattern: sed -e "s/\$1/@root@The-Three-Little-Pigs-Siri-Proxy/" -i gen_certs.sh, since $1 denotes a back reference in sed (presuming you want to replace the string $1 in your input, right?)

Upvotes: 1

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