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Shell Programming and Scripting

Negation in "tr"

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Top Forums Shell Programming and Scripting Negation in "tr"
# 15  
Old 09-28-2010
Code:
$ echo hi|ruby -e 'p gets.chomp!.tr("^h","j")'
"hj"

Quote:
Originally Posted by prasanna1157
Actually I want to count the number of positive and negative numbers in the list eventually.
Code:
$ ruby -00 -ne 'n,p=$_.split.partition {|x| x.to_i<0};END{print "positive: #{p.size}, negative: #{n.size}\n" }' file
positive: 3, negative: 3

# 16  
Old 09-28-2010
Is there an option in sort or uniq that could sort and print only the negative numbers, omitting the positive ones, and vice versa?
# 17  
Old 09-28-2010
see other thread
# 18  
Old 09-29-2010
Quote:
echo hi there | tr -c '\n' 'h'
Only certain versions of "tr" will work with the above syntax.
Most of them will just put a single "h" character in the first position of the translation table and nowhere else.


This is the correct syntax to expand the string of "h" characters to fill every slot in the transalation table except the linefeed character.
Code:
echo "hi there" | tr -c '\n' '[h*]'
hhhhhhhh

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