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AIX sed/awk

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# 1  
Old 01-22-2013
AIX sed/awk
I'm trying to change the pam.conf file like below.

Code:
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

to

Code:
ssh     auth    required        /usr/lib/security/pam_aix
ssh     account required        /usr/lib/security/pam_aix
emagent auth    required        /usr/lib/security/pam_aix
emagent account required        /usr/lib/security/pam_aix

As suggest on previous forum I tried

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

It is working fine but changing the content with format as below.


Code:
authexec        session required        /usr/lib/security/pam_prohibit
sshd    auth    required        /usr/lib/security/pam_prohibit
sshd    account required        /usr/lib/security/pam_prohibit
sshd    password        required        /usr/lib/security/pam_prohibit
sshd    session required        /usr/lib/security/pam_prohibit
ssh auth required /usr/lib/security/pam_aix
ssh account required /usr/lib/security/pam_aix
ssh password required /usr/lib/security/pam_aix
ssh session required /usr/lib/security/pam_aix
emagent auth required /usr/lib/security/pam_aix
emagent account required /usr/lib/security/pam_aix
emagent password required /usr/lib/security/pam_aix
emagent session required /usr/lib/security/pam_aix

Is there any way that we could use sed -i for this or awk without changing the format?
# 2  
Old 01-22-2013
Can you set OFS and re-try?
Code:
awk -FS='\t' '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' OFS='\t' /etc/pam.conf

# 3  
Old 01-22-2013
Code:
cat /etc/pam.conf | \
awk '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' OFS='\t' > /etc/pam.conf


The above worked. I really appreciate your help. Would you mind explaining me the whole command above?

Thanks a lot.
# 4  
Old 01-22-2013
Quote:
Originally Posted by pjeedu2247
Code:
cat /etc/pam.conf | \
awk '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' OFS='\t' > /etc/pam.conf


The above worked. I really appreciate your help. Would you mind explaining me the whole command above?

Thanks a lot.
The command bipinajith supplied:
Code:
awk -FS='\t' '$1=="ssh"||$1=="emagent"{sub("prohibit","aix",$NF);}1' OFS='\t' /etc/pam.conf

reads lines from /etc/pam.conf and for any line where the first field is exactly the string ssh or the string emagent it replaces the string prohibit in the last field in the line with the stringaix. It then writes the updated file to standard output (usually the terminal where you run the command) unless you redirect the output to a different file.

The pipeline that you say is working should turn the file /etc/pam.conf into an empty file. The pipeline uses that file both as an input file and as an output file. When you do this, the shell will throw away the current contents of the file before starting cat to feed the (now empty) contents of the file into awk.
# 5  
Old 01-22-2013
That makes complete sense. I really appreciate your effort. Thanks again.
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