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Adding field to file

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# 1  
Old 04-05-2016
Code Adding field to file
Hi I have file as given below
Code:
040|14300|40.0|563000
042|13200000|40.0
041|100|40.0
043|10000|40.0
045|102|40.0

I want to check
if field 4 is null then I have to place | in position 4.

result set should be

Code:
040|14300|40.0|563000
042|13200000|40.0|
041|100|40.0|
043|10000|40.0|
045|102|40.0|

# 2  
Old 04-05-2016
Any attempts/ideas/thoughts from your side?

However. try
Code:
awk '{NF = 4}1' FS="|" OFS="|" file
040|14300|40.0|563000
042|13200000|40.0|
041|100|40.0|
043|10000|40.0|
045|102|40.0|

Last edited by RudiC; 04-05-2016 at 08:02 AM..
This User Gave Thanks to RudiC For This Post:
shabeena
# 3  
Old 04-05-2016
I want to write in same file ?
# 4  
Old 04-05-2016
Above will not necessarily work with ALL awk versions. Try
Code:
awk 'NF < 4{$4 = ""}1' FS="|" OFS="|" file

instead.
# 5  
Old 04-05-2016
To overwrite the input file, redirect the output to a temp file, and then, if successful, mv temp back to the original file.
This User Gave Thanks to RudiC For This Post:
shabeena
# 6  
Old 04-05-2016
yes, it working . iam getting | in 4th position ,if field 4 is null.

I want overwrite in same file? by using sed command?
# 7  
Old 04-05-2016
try:
Code:
ex infile << EDIT
$( awk 'NF<4 {o=$0; NF=4; print NR; print "s/" o "/" $0 "/"}' FS="|" OFS="|" infile)
w!
EDIT

Last edited by rdrtx1; 04-05-2016 at 05:55 PM..
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