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How to rewrite a line in a file

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Top Forums Shell Programming and Scripting How to rewrite a line in a file
# 8  
Old 05-15-2007
Hi Jean-Pierre

I thought " and ' are refering to the same thing in unix. After changing " to ', the problem solved. Sorry for all the trouble.
# 9  
Old 05-16-2007
hi

can I use awk command to change word 2 on line 2 and word 3 on line 3 into 777 and 555 respectively (for example)? if yes, how should I write the awk syntax?
# 10  
Old 05-16-2007
Quote:
Originally Posted by c0384
hi

can I use awk command to change word 2 on line 2 and word 3 on line 3 into 777 and 555 respectively (for example)? if yes, how should I write the awk syntax?
Code:
awk ' { if (NR == 2) { $2 = 777 } if (NR == 3) { $3 = 555 } print } ' filename

# 11  
Old 05-17-2007
Hi

may I know whether the following syntax is correct or not? if not, what should be the correct one?

awk ' { if (NR == 2) { $2 = 777 $1 = 888 } if (NR == 3) { $3 = 555 } print } ' filename
# 12  
Old 05-17-2007
Quote:
Originally Posted by c0384
Hi

may I know whether the following syntax is correct or not? if not, what should be the correct one?

awk ' { if (NR == 2) { $2 = 777 $1 = 888 } if (NR == 3) { $3 = 555 } print } ' filename
Add a semicolon
Code:
awk ' { if (NR == 2) { $2 = 777 ;$1 = 888 } if (NR == 3) { $3 = 555 } print } ' filename

# 13  
Old 05-17-2007
may i know how awk command count the number of words in a line?
for example
123,134,156 - is it counted as one words only? or 5 words?

If I wish to modify only 123 and 134 to 555 and 333 respectively (let says) in the line which has the pattern above, how should I go about to do it?
# 14  
Old 05-17-2007
Quote:
Originally Posted by c0384
may i know how awk command count the number of words in a line?
for example
123,134,156 - is it counted as one words only? or 5 words?

If I wish to modify only 123 and 134 to 555 and 333 respectively (let says) in the line which has the pattern above, how should I go about to do it?
Quote:
123,134,156
If you specify field separator as comma then here you have three fields or words.
$1 gives first field
$2 gives second field and so on.
Code:
$1 = 555
$2 = 333

This will modify the first and second field.
Last edited by anbu23; 05-17-2007 at 07:41 AM..
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