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Shell Programming and Scripting

Negation in "tr"

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# 1  
Old 09-28-2010
Negation in "tr"
Is there an option for negation in the "tr" command?

For eg:

echo hi | tr "h" "i"

will print "ii".

But if I want to covert all characters that are not "h" to "j", how do I do that?

Is there something like "!" in tr? Or any switch?


Thanks,
Prasanna
# 2  
Old 09-28-2010
Code:
$ echo hi | sed "s/[^h]/j/g"
hj

# 3  
Old 09-28-2010
Code:
$ echo hi | tr -c 'h\n' 'i'
hi

# 4  
Old 09-28-2010
Negation in "tr"
Thanks.

But I would like to output "hh"

by doing something like echo hi | tr (convert all non-h characters to h).

Is there a way to do this?
# 5  
Old 09-28-2010
Code:
$ echo hi | tr -c 'h\n' 'h'
hh

# 6  
Old 09-28-2010
Negation in "tr"
What does that \n do?

And is the -c used for complement/negation?
# 7  
Old 09-28-2010
1. \n is just a character (linefeed) that you probably do not want converted to the character "h"
2. yes

---------- Post updated at 00:59 ---------- Previous update was at 00:57 ----------

since you are converting any character that is not h to h, but h is h anyway, this would be equivalent:
Code:
$ echo hi there | tr -c '\n' 'h'
hhhhhhhh
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