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Shell Programming and Scripting

Checking for invalid chars

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# 1  
Old 03-07-2005
Checking for invalid chars
Hi there!
Can you please tell me how to check for ctrl chars or noprintable chars in a batch file ??
I suspect that some of my file is corrupted by those chars and i dont know how to chase them ...

Thanks a lot!
# 2  
Old 03-07-2005
You could use od -tc to view the file.... I created a quick junk file, take a look....
Code:
$ od -tc ctrltest
0000000  007     002      \r      \t      \n      \b 020 017  \t 025  \n
0000020    h   e   l   l   o  \n
0000026

As you can see, there are standard characters, and non-printing/control chars there. Some are represented by their octal value - check man ascii to see what they are.

Read the man page for od - there are a plethora of output formatting options available to help you.

Cheers
ZB
# 3  
Old 04-03-2005
you could also use ...
Code:
cat -v file

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