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04-25-2007
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Control character in a file
Hi All,
I am looking for a solution to capture any ASCII control character in a file ( where the ASCII control character is in decimal value from 0 to 31 and 127 ( Hex value from 00 to 1F and 7F ) ) by returning any affected lines. The intended good file should contain "ASCII printable character" where ASCII printable character is in decimal value from 32 to 126 ( Hex value from 20 to 7E ). Thanks in advance. Best regards, cursive 
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04-25-2007
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Removes ASCII control characters from 0 to 31 and 127
Code:
tr -d "\000-\037\177" < file Code:
while read line
do
[[ -n "$( echo $line | tr -d "\000-\037\177" )" ]] && echo "$line"
done < file
Last edited by anbu23; 04-25-2007 at 02:33 AM. Reason: Not read requirement properly
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04-25-2007
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you may also want to try awk's POSIX character classes like [:print:],[:graph:] etc...
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04-25-2007
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Hi Anbu23,
I am not sure if I missing something here by using the given solution : tr -d "\000-\037\177" < file because the output is still contained the control character. Provided a sample of the input file : ------------------------------------------------- Monday Tuesday Wednesday Thursday Friday Saturday Sunday Number = 0.36")· ) Apple orange Pinapple Output file ( display lines with control character ): --------------- >Monday Tuesday Wednesday >Saturday >Number = 0.36")· ) >Apple orange > Thanks in advance, cursive
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04-25-2007
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Code:
/db2home/training$ cat -e f Monday Tuesday Wednesday$ Thursday Friday$ Saturday ^F$ Sunday$ Number = 0.36")· )$ $ Apple orange $ Pinapple$ ^G$ /db2home/training$ tr -d "\000-\011\013-\037\177-\377" < f | cat -e Monday Tuesday Wednesday$ Thursday Friday$ Saturday $ Sunday$ Number = 0.36") )$ $ Apple orange $ Pinapple$ $
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Linear Mode
