Need to replace one string, in a file, with another string from a different file ...

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# 8  
Old 09-13-2009
sample example files are:
//=====shadow1 (contains something like below)==========

//=============shadow1 (ends here)=======================

//=====shadow2 (contains something like below)==========


//=============shadow2 (ends here)=======================

Please note that password hashes of the user 'David' is different in shadow2.

What I need is a file in output called (say shadow3) as below

//=====shadow3 (contains something like below)==========

//=============shadow3 (ends here)=======================

Please note again that the output file contains a password hash from shadow2 file and rest is from shadow1.

Last edited by Praveen_218; 09-13-2009 at 12:03 PM.. Reason: Please use code tags!
# 9  
Old 09-13-2009
awk -F: -v OFS=":" 'NR==FNR{_[$1]=$2;next}_[$1]{$2=_[$1]}1' shadow2 shadow1

# 10  
Old 09-13-2009
Originally Posted by know d unknown
awk -F":" 'NR==FNR{a[$1]=$2; next} NR!=FNR{if(a[$1])print $1," ",a[$1]; else print $0 }' file2 file1

which semicolon you are pointing to...i dint get you ???
As far as I can see there is only one "else" so it should be obvious which ; I mean. OP said he was getting syntax error at "else" and I am pointing out one possible reason for it. He would get the same syntax error if he had inadvertently used a , instead of the ; .

@vi_curious i think you are new to scripting i guess semicolon always means enter or new line so that shouldnt be a prob...
It is a problem if it's not there when it should be.
# 11  
Old 09-13-2009
the output which got:

awk -F":" 'NR==FNR{a[$1]=$2; next} NR!=FNR{if(a[$1])print $1," ",a[$1]; else print $0}' shadow2 shadow1
David   $1$FbP0lc8N$MIJ8outnkYyBedIYK7TJ6.
sarvani   $1$0wPwj2dB$GSHkbM9kcPZkGPTdKfZJP1

i dono why are you getting the error ??? if you could paste the error that would be greatful

Last edited by Franklin52; 09-13-2009 at 11:10 AM.. Reason: Please use code tags!
# 12  
Old 09-13-2009
Originally Posted by know d unknown
am sorry i dint get the error...
can you please give the complete error...
for the time being can you just try the following code

awk -F":" 'NR==FNR{a[$1]=$2; next} NR!=FNR{if(a[$1])print $1," ",a[$1]; }' file2 file1
I ran your script on my Linux machine ; probably earlier I had a typo or something else.
# 13  
Old 09-13-2009
Try this:

awk -F":" -v user="David" 'NR==FNR{a[$1]=$2; next}$1==user{$2=a[$1]}1' OFS=":" shadow2 shadow1 > shadow3

# 14  
Old 09-13-2009
hi vi...

wen your replied
" Is it possible you left out the ; before the else? That would give a syntax error."

i have already posted two codes and i couldnt fig out which one u were pointing to...
moreover i thought you were asking me if the code was wrong...coz it was next to my reply... am sorry i dint get wat u were trying to explain at tat point...
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