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Full Discussion: tr command
Top Forums UNIX for Dummies Questions & Answers tr command Post 302455638 by pushparaj_bits on Wednesday 22nd of September 2010 05:47:13 AM
Old 09-22-2010
tr command
Hi all,

man tr says
tr [OPTION]... SET1 [SET2]
SETs are specified as strings of characters

I did not understand the terms " strings of characters"

when I surfed the net I got some examples like
tr -d '\015' file1

Does \015 is string of characters or '\015' is string of characters.
Basically I want to know the definition of string .

In the page http://www.linfo.org/tr.html

It mentions that ,tr can also translate any number of specified characters into other characters. In such case, each of the two sets needs to be enclosed in square brackets, and these brackets, in turn, need to be enclosed in quotation marks. Either single of double quotation marks can be used.
I had seen example
tr -d '\015' file1
working fine with out quotes or double quotes.

Can somebody tell me what exactly the input format for tr.

Thanks in Advance
 

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LEARN ABOUT OPENDARWIN

strings

STRINGS(1)						      General Commands Manual							STRINGS(1)

NAME

       strings - find the printable strings in a object, or other binary, file

SYNOPSIS

       strings [ - ] [ -a ] [ -o ] [ -number ] [file ...]

DESCRIPTION

       Strings	looks  for ASCII strings in a binary file or standard input.  Strings is useful for identifying random object files and many other
       things.	A string is any sequence of 4 (the default) or more printing characters ending with a newline or a null.  Unless  the  -  flag	is
       given,  strings	looks in all sections of the object files except the (__TEXT,__text) section.  If no files are specified standard input is
       read.

       The options to strings(1) are:

       -a     This option causes strings to look for strings in all sections of the object file (including the (__TEXT,__text) section.

       -      This option causes strings to look for strings in all bytes of the files (the default for non-object files).

       -o     Preceded each string by its offset in the file (in decimal).

       -number
	      The decimal number is used as the minimum string length rather than the default of 4.

SEE ALSO

       od(1)

BUGS

       The algorithm for identifying strings is extremely primitive.

Apple Computer, Inc.						 October 23, 1997							STRINGS(1)
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