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Shell Programming and Scripting

Need help in setting up a script..

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Top Forums Shell Programming and Scripting Need help in setting up a script..
# 8  
Old 01-09-2008
and this command did the trick...comm -3 file1 file2 >> file2
thanks
# 9  
Old 01-09-2008
Quote:
Originally Posted by spikywits
Thanks...exactly what i require...excellent job.

need some clarification....what does this statement do dd if=$1 of=temp.$$ bs=1 skip=$offset count=$size > /dev/null 2>&1
dd is a method of copying data around, if= is where you specify the file (or device) to read from, of= is for the output file (or device) bs=1 means a block size of 1 byte (ie we read byte by byte), skip= says how many blocks to skip before beginning the copy, count= says how many blocks to copy.

man dd for more information.
# 10  
Old 01-09-2008
Quote:
Originally Posted by ghostdog74
just to get you started, here's one way.
Code:
# comm -3 file file1
ratxxxx

Then you can just pipe this output to B.
I just had a play with this on Solaris, it looks like comm works a little differently.

On your system, with the above example, does comm -3 file1 file2 produce the string 'ratxxxx' even if file1 has a lot of lines at the start (ie before 'hatxxxx')?
# 11  
Old 01-09-2008
Quote:
Originally Posted by Smiling Dragon
I just had a play with this on Solaris, it looks like comm works a little differently.

On your system, with the above example, does comm -3 file1 file2 produce the string 'ratxxxx' even if file1 has a lot of lines at the start (ie before 'hatxxxx')?
nope. I assume file1 and file2 are similar , only difference is file2 is always later than file1. Smilie
# 12  
Old 01-09-2008
Quote:
Originally Posted by ghostdog74
nope. I assume file1 and file2 are similar , only difference is file2 is always later than file1. Smilie
In that case:
Code:
cp file1 file2

Smilie
# 13  
Old 01-09-2008
Quote:
Originally Posted by Smiling Dragon
In that case:
Code:
cp file1 file2

Smilie
lol, true. sometimes we forget the basic things
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