CODEWITHSUNDEEP
bashshell
manga
manga

Reputation: 105

sed replace in conf 2 different patterns

i want to replace 2 entrys in conf file with sed

# Set Server
/bin/sed -i 's/server: 127.0.0.1/server: xxx.xxx.xxx.xxx/' /etc/cobbler/settings

# Set next Server
/bin/sed -i 's/next_server: 127.0.0.1/next_server: 192.168.122.1/' /etc/cobbler/settings

for some reason it changes the the primary entry on both, why ? i use 2 different patterns to check for "server" & "next_server"

also i would like to know how i could change a quoted string pattern

#change default password    
/bin/sed -i 's/default_password_crypted: "$1$mF86/UHC$WvcIcX2t6crBz2onWxyac."/default_password_crypted: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"/' /etc/cobbler/settings

thx

Upvotes: 4

Views: 145

Answers (3)

kamae
kamae

Reputation: 1867

If your line server: 127.0.0.1 has no extra space or other string in the line, you should add ^ and $.

/bin/sed -i 's/^server: 127.0.0.1$/server: xxx.xxx.xxx.xxx/' /etc/cobbler/settings

And your second question, you need to escape $.

/bin/sed -i 's;default_password_crypted: "\$1\$mF86/UHC\$WvcIcX2t6crBz2onWxyac.";default_password_crypted: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";' /etc/cobbler/settings

Upvotes: 1

MGP
MGP

Reputation: 3031

Just add a ^ to the beginning of your regexp to require the line starting with exactly that string.

# Set Server
/bin/sed -i 's/^server: 127.0.0.1/server: xxx.xxx.xxx.xxx/' /etc/cobbler/settings

# Set next Server
/bin/sed -i 's/^next_server: 127.0.0.1/next_server: 192.168.122.1/' /etc/cobbler/settings

Upvotes: 0

anubhava
anubhava

Reputation: 784948

It is happening because your first matching regex is:

server: 127.0.0.1

And 2nd one is:

next_server: 127.0.0.1

As you can see first regex will match both the patterns since server: 127.0.0.1 is found for both cases.

Fix: To avoid unwanted matching you need to use word boundaries like this:

sed -i.bak 's/\b\(server: \)127.0.0.1/\1xxx.xxx.xxx.xxx/' /etc/cobbler/settings

Note: On OSX you need to use this weird syntax for word boundaries:

sed -i.bak 's/[[:<:]]\(server: \)127.0.0.1/\1xxx.xxx.xxx.xxx/' /etc/cobbler/settings

Upvotes: 1

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