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Shell Programming and Scripting
Trimming Spaces in Unix
Post 302596861 by Shirishlnx on Wednesday 8th of February 2012 12:11:39 PM
02-08-2012
I know.. but.. above for simple understand ... as per que asked .. 
Note: SPACE here always have to be in lower case .... [:space:]
# a="a b c"
# echo $a | tr -d [:SPACE:]
tr: invalid character class `SPACE'
Also
# echo $a | tr -d [:space:]
b c <-- Missing 1st char ...
# echo $a | tr -d "[:space:]" <-- Must be quoted
abc
There are multiple ways ... using sed, awk, tr etc...
-Shirish
Note: SPACE here always have to be in lower case .... [:space:]
# a="a b c"
# echo $a | tr -d [:SPACE:]
tr: invalid character class `SPACE'
Also
# echo $a | tr -d [:space:]
b c <-- Missing 1st char ...
# echo $a | tr -d "[:space:]" <-- Must be quoted
abc
There are multiple ways ... using sed, awk, tr etc...
-Shirish
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