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Full Discussion: tr command
Top Forums UNIX for Dummies Questions & Answers tr command Post 302389966 by colum.kennedy on Tuesday 26th of January 2010 01:42:27 PM
Old 01-26-2010
tr command
Hi.

This is my first post,

I am trying to change certain sections of a file from UPPERCASE to lowercase. For this I am using the tr command. The thing is it is changing all of the text in the file to lowercase. My question is "can you use pattern matching or something in conjunction with tr to selectively change text?"

Eg: my code is

line_x (P) { ....
line_y (Q) { ...........
line_z(P Q) {..............

I only want to make whatever is in line_y to lowercase.
(there are multiple instances of line y)

Currently I am doing something like this:

tr "*(line_y ([A-Z]) {)" "*(line_y ([a-z]) {)" < file.orig > file.mod

but this is still just making all text lower case.

Any help or input would be greatly appreciated.

Kind Regards,

Colum.
 

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LEARN ABOUT SUSE

towlower

TOWLOWER(3P)						     POSIX Programmer's Manual						      TOWLOWER(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       towlower - transliterate uppercase wide-character code to lowercase

SYNOPSIS

       #include <wctype.h>

       wint_t towlower(wint_t wc);

DESCRIPTION

       The towlower() function has as a domain a type wint_t, the value of which the application shall ensure is a character  representable  as  a
       wchar_t,  and  a wide-character code corresponding to a valid character in the current locale or the value of WEOF. If the argument has any
       other value, the behavior is undefined. If the argument of towlower() represents an uppercase wide-character code, and there exists a  cor-
       responding  lowercase  wide-character  code (as defined by character type information in the program locale category LC_CTYPE ), the result
       shall be the corresponding lowercase wide-character code.  All other arguments in the domain are returned unchanged.

RETURN VALUE

       Upon successful completion, towlower() shall return the lowercase letter corresponding to the argument passed; otherwise, it  shall  return
       the argument unchanged.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <wctype.h>, <wchar.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							      TOWLOWER(3P)
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