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Using sed to replace a word at specific location

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# 1  
Old 01-17-2013
Using sed to replace a word at specific location
I'm try to change a the prohibit to aix for the lines starting with ssh and emagent and rest should be the same. Can anyone please suggest me how to do that using a shell script or sed
Code:
passwd  account required        /usr/lib/security/pam_prohibit
passwd  session required        /usr/lib/security/pam_prohibit
sshd    auth    required        /usr/lib/security/pam_prohibit
sshd    account required        /usr/lib/security/pam_prohibit
ssh     auth    required        /usr/lib/security/pam_prohibit
ssh     account required        /usr/lib/security/pam_prohibit
emagent auth    required        /usr/lib/security/pam_prohibit
emagent account required        /usr/lib/security/pam_prohibit

Thank you
Last edited by Scott; 01-18-2013 at 03:09 AM.. Reason: Code tags
# 2  
Old 01-18-2013
Code:
awk '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' filename

# 3  
Old 01-18-2013
Hi,

if you are unfamilier with awk, you can use below sed command.

Code:
#search for lines start with ssh and emagent and replace prohibit with aix
sed "/ssh\|emagent/s/prohibit/aix/g" $file

Last edited by Scott; 01-18-2013 at 03:10 AM.. Reason: Code tags
# 4  
Old 01-18-2013
I tried using both awk and sed as suggested above but non of them have resolved the issue Smilie

Code:
file="/etc/pam.conf"
sed "/ssh\|emagent/s/prohibit/aix/g" $file

cat /etc/pam.conf | \
sed "/ssh\|emagent/s/prohibit/aix/g" > /etc/pam.conf

cat /etc/pam.conf | \
sed -e "/ssh\|emagent/s/prohibit/aix/g" > /etc/pam.conf

cat /etc/pam.conf | \
sed -e '/ssh\|emagent/s/prohibit/aix/' > /etc/pam.conf

awk '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' /etc/pam.conf

nothing really worked Smilie


/etc/pam.conf is big file which have lot of other date too .
Last edited by Scott; 01-18-2013 at 03:11 AM.. Reason: Code tags
# 5  
Old 01-18-2013
What is the output with sed cammand???

Please take a backup of /etc/pam.conf

try this once...

Code:
sed -i "/ssh\|emagent/s/prohibit/aix/g" /etc/pam.conf

open /etc/pam.conf file and check whether it was changed accordingly or not.

Please send me the output if you face any problem.
Last edited by Scott; 01-18-2013 at 03:11 AM.. Reason: Code tags
# 6  
Old 01-18-2013
Code:
# ./test2.sh
sed: Not a recognized flag: i
Usage:  sed [-n] [-u] Script [File ...]
        sed [-n] [-u] [-e Script] ... [-f Script_file] ... [File ...]


Yes, I took the backup of /etc/pam.conf file. It is not allowing me to use "-i" in script.
Last edited by Scott; 01-18-2013 at 03:12 AM.. Reason: Code tags
# 7  
Old 01-18-2013
Quote:
Originally Posted by srinivas matta
What is the output with sed cammand???

Please take a backup of /etc/pam.conf

try this once...

sed -i "/ssh\|emagent/s/prohibit/aix/g" /etc/pam.conf

open /etc/pam.conf file and check whether it was changed accordingly or not.

Please send me the output if you face any problem.
I have tried the above command with your file data only. its working fine for me.
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