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replace ascii chars without loosing it.

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# 1  
Old 01-31-2006
replace ascii chars without loosing it.

Can some one tell, how to replace ascii non printable TAB from the while to something, then later on replace it back to TAB.

Basciallz we do bulk data processing, our processin treats TAB as new field ,
So I thought we can replace it with something and later on revert it.

# 2  
Old 01-31-2006
check out the tr utility man tr
tr -s '\t' ':'

tr changes tabs to colons in this example
# 3  
Old 01-31-2006

thanks, however irrespective of any number of occurences of tab 'tr' will replace each occurences with single occurence(replacable) chars.

i.e input is

note : pls read {1\t} as 1 tab and {2\t} as 2 tabs

the statement cat abc | tr -s '\t' '#' replace any number of occurences on each line to just one. However I wanna retain the number of each occurences in this case number of tabs, so that after processing I can put it back in the respective places.

Hope I'm clear

Last edited by braindrain; 01-31-2006 at 06:49 PM..
# 4  
Old 01-31-2006
Don't use the -s (squeeze) option of tr and it will perform a one-for-one replacement...
$ printf "\t\t\t\n" | tr '\t' '#'

# 5  
Old 02-01-2006
Thanks, it gave me some idea, but doesn#t exaclty suit my requirement, so i tried with sed and it works.

sed s/\\t/#0#/g input_file

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