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How to grep a single field from a line?

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# 1  
Old 11-12-2013
How to grep a single field from a line?
hi,

i have a text file with some fields.
file.txt
Code:
aaa|bbb|ccc|1-sh|2-sh|5-sh
ddd|eee|fff|1-sh|4-sh

i am selecting a line using grep command using the combination of 1st 3 column.
Code:
grep "aaa|bbb|ccc" file.txt

output:
aaa|bbb|ccc|1-sh|2-sh|5-sh

now i want to cut a field from this line.
if i am passing 2 as a parameter to a program, then it should cut "2-sh", if i specify 5 then it should cut 5-sh and so on.
# 2  
Old 11-12-2013
Hi,

Could you please use the following code.

Code:
echo "aaa|bbb|ccc|1-sh|2-sh|5-sh" | awk -F"|" '{print $5}'

Output will be as follows.

Code:
2-sh

kindly let me know if you have any queries for same.



Thanks,
R. Singh
# 3  
Old 11-12-2013
Your specification is a bit difficult to interpret. If you, in a line that begins with "aaa|bbb|ccc", want that field that begins with your parameter value (2 or 5), try
Code:
awk '-F|' '/^aaa|bbb|ccc/ {for (i=4; i<=NF; i++) if ($i ~ "^"fn) print $i}' fn=2 file
2-sh

Last edited by RudiC; 11-12-2013 at 08:04 AM..
# 4  
Old 11-12-2013
Try something like this

Code:
$ cat <<eof | awk -F"|" '/^aaa\|bbb\|ccc/{for(i=1;i<=NF;i++)if($i~search"-sh")print $i}' search=1
aaa|bbb|ccc|1-sh|2-sh|5-sh
ddd|eee|fff|1-sh|4-sh
eof     

1-sh
$ cat <<eof | awk -F"|" '/^aaa\|bbb\|ccc/{for(i=1;i<=NF;i++)if($i~search"-sh")print $i}' search=2
aaa|bbb|ccc|1-sh|2-sh|5-sh
ddd|eee|fff|1-sh|4-sh
eof

2-sh
$ cat <<eof | awk -F"|" '/^aaa\|bbb\|ccc/{for(i=1;i<=NF;i++)if($i~search"-sh")print $i}' search=5
aaa|bbb|ccc|1-sh|2-sh|5-sh
ddd|eee|fff|1-sh|4-sh
eof

5-sh

@RudyC I think you missed back slash

Code:
$ cat <<eof | awk -F"|" '/^aaa|bbb|ccc/{for(i=1;i<=NF;i++)if($i~search"-sh")print $i}' search=1
aaa|bbb|ccc|1-sh|2-sh|5-sh
ddd|eee|fff|1-sh|4-sh
aaa|1-sh
eof

1-sh
1-sh

$ cat <<eof | awk -F"|" '/^aaa\|bbb\|ccc/{for(i=1;i<=NF;i++)if($i~search"-sh")print $i}' search=1
aaa|bbb|ccc|1-sh|2-sh|5-sh
ddd|eee|fff|1-sh|4-sh
aaa|1-sh
eof

1-sh

# 5  
Old 11-12-2013
@Akshay Hegde: Not needed for my mawk. But, doesn't hurt, either. Thanks for pointing out.
# 6  
Old 11-12-2013
@ RudiC : I tried in gawk so posted..
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