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11-19-2008
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Substitution using awk/gawk
Hello, I have a file containing lines such as: Code:
(1 104 (16) (17) (18) (102))$
(1 105 (16) (17) (19:21) (102))$
I would like to extract the numbers, only by using awk (or gawk). I do not want to use "sed" as it is very slow. For now my solution consists in using the sub command with gawk, and substitute "(", ")" and "$" by "". However I don't know how to do these substitution with only one "sub" command (I am using 4 "sub" commands). Do you have any idea how I could improve my script to do that? Thanks |
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11-19-2008
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tr was made for that. Code:
tr -d '($)' < file And here is the time test: Code:
# time awk '{gsub("[($)]","",$0)}1' file > /dev/null
real 0m0.311s
user 0m0.244s
sys 0m0.028s
# time tr -d '($)' < file > /dev/null
real 0m0.065s
user 0m0.024s
sys 0m0.004s
# time sed 's/(\|\$\|)//g' file > /dev/null
real 0m1.144s
user 0m1.092s
sys 0m0.000s
# wc file
18000 108000 738000 file
Last edited by danmero; 11-19-2008 at 09:17 PM.. |
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11-19-2008
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Thank you!
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