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# 1  
Old 08-23-2010
Replace based on an exact position

Trying to use sed - but having no luck.

I have a text file - I want to replace whatever character is in position 106, 157 and 237 w/ the string "xxx". Want this change for all lines w/in that text file.

I'm open to using awk or whatever command would be best for replacing characters based on the exact position. Seems like sed can do a lot, but for whatever reason, have had no luck figuring out how to replace on just position alone.

Thanks much!
# 2  
Old 08-23-2010
I know its Perl, and it looks ugly, but if you don't mind that then here it goes:
perl -pe 's/(.{105}).(.{50}).(.{79}).(.*)/\1xxx\2xxx\3xxx\4/' file > out.file

I hope I didn't mess numbering Smilie
This User Gave Thanks to bartus11 For This Post:
# 3  
Old 08-23-2010
works great. thanks again!
# 4  
Old 08-24-2010
sed -n 's/\(.\{105\}\).\(.\{50\}\).\(.\{79\}\).\(.*\)/\1XXX\2XXX\3X\4/gp'  sample_file

# 5  
Old 08-24-2010
sed 's/./xxx/237;s/./xxx/157;s/./xxx/106' infile

# 6  
Old 08-26-2010
awk -F "" '{for (i=1;i<=NF;i++) if (i==106||i==157||i==237) $i="xxx"}1' OFS="" urfile

This User Gave Thanks to rdcwayx For This Post:
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