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To append Character in file

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# 1  
Old 09-04-2013
To append Character in file


i am having a file which is comma seperated , i need to append a char in particular column

for eg:

i need to append for eg 4th column with a char like 'LQ'


here if any column occurs , as coulmn
for eg:


i need to consider "dd,xx" as whole col and resulting to LQdd,xx

# 2  
Old 09-04-2013
Attached is a solution based on Lorance Stinson's CSV Parser

run it like this:

$ awk -f add_LQ.awk.txt infile

# 3  
Old 09-05-2013
Anoter awk
cat file

awk -F, '
	for (i=1;i<=NF;i++)
		if ($i!~/^"|"$/) {a[++f]=$i}
		else if ($i~/^"/) {a[++f]=$i}
		else {a[f]=a[f]","$i}
	for (i=1;i<f;i++) printf "%s,",a[i]
	print a[f]
	delete a;
	' file

Last edited by Jotne; 09-05-2013 at 07:08 AM.. Reason: Updated to show that it works with multiple ""
# 4  
Old 09-05-2013
With some assumptions

awk -F, '/\"/{L=5} !/\"/ || $4~/^\"/{L=4}  {$L=sub(/\"/,"",$L)?"\"LQ"$L:"LQ"$L}1' OFS="," file


# 5  
Old 09-05-2013
This fails if there are more than on filed with "" before hit.
aa,"bb,rr","cc,aa",dd,ee gives aa,"bb,rr","LQcc,aa",dd,ee
Corret aa,"bb,rr","cc,aa",LQdd,ee
# 6  
Old 09-05-2013
Another approach:
awk -F, -v c=LQ '{match($4,/^"/);sub(/"/,"",$4);$4=RSTART?"\""c$4:c$4}1' OFS=, file

# 7  
Old 09-05-2013
Your does also fail with this line:
aa,"bb,rr","cc,aa",dd,ee gives aa,"bb,rr","LQcc,aa",dd,ee

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