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To append Character in file

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

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

for eg:
Code:
infile
aa,bb,c,dd,ee
zz,yy,sss,ddd,ff
.
.

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

output:
Code:
aa,bb,c,LQdd,ee
zz,yy,sss,LQddd,ff

here if any column occurs , as coulmn
for eg:

Code:
aa,bb,c,"dd,xx",ee

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:

Code:
$ awk -f add_LQ.awk.txt infile

add_LQ.awk.txt (4.4 KB) 
# 3  
Old 09-05-2013
Anoter awk
Code:
cat file
aa,"bb,rr","cc,aa",dd,ee
aa,bb,c,dd,ee
zz,yy,sss,ddd,ff
aa,bb,c,"dd,xx",ee

Code:
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}
	}
	{a[4]=(a[4]~/^\"/)?"\"LQ"substr(a[4],2):"LQ"a[4]
	for (i=1;i<f;i++) printf "%s,",a[i]
	print a[f]
	delete a;
	f=0}
	' file
aa,"bb,rr","cc,aa",LQdd,ee
aa,bb,c,LQdd,ee
zz,yy,sss,LQddd,ff
aa,bb,c,"LQdd,xx",ee

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

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

aa,"bb,rr",c,LQdd,ee
aa,bb,c,LQdd,ee
zz,yy,sss,LQddd,ff
aa,bb,c,"LQdd,xx",ee

# 5  
Old 09-05-2013
@pamu
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:
Code:
awk -F, -v c=LQ '{match($4,/^"/);sub(/"/,"",$4);$4=RSTART?"\""c$4:c$4}1' OFS=, file

# 7  
Old 09-05-2013
@Subbeh
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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