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Full Discussion: Confusion in working of carat(^) symbol
Top Forums UNIX for Beginners Questions & Answers Confusion in working of carat(^) symbol Post 303009852 by RudiC on Thursday 21st of December 2017 06:09:14 AM
Old 12-21-2017
From the context. First we need to know that you seem to be talking of regexes, because a carat can have even more meanings, e.g. exponentiation in several programming languages, upper case conversion in certain shells' "Case Modification Parameter Expansion", or used to produce characters like â in the French locale.
In regexes, if used as the first character in a matching pattern, it anchors the pattern at BOL. If not the first character, it is treated as is, i.e. there must be a carat in the text to match the carat in the regex.
In a bracket expression, if the list begins with '^', it matches any single character not from the rest of the list.
Last edited by RudiC; 12-21-2017 at 07:42 AM..
 

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LEARN ABOUT PLAN9

nm

NM(1)							      General Commands Manual							     NM(1)

NAME

       nm - name list (symbol table)

SYNOPSIS

       nm [ -aghnsu ] file ...

DESCRIPTION

       Nm  prints  the	name list of each executable or object file in the argument list.  If the file is an archive (see ar(1)), the name list of
       each file in the archive is printed.  If more than one file is given in the argument list, the name of each file is printed at  the  begin-
       ning of each line.

       Each symbol name is preceded by its hexadecimal value (blanks if undefined) and one of the letters

       T      text segment symbol

       t      static text segment symbol

       L      leaf function text segment symbol

       l      static leaf function text segment symbol

       D      data segment symbol

       d      static data segment symbol

       B      bss segment symbol

       b      static bss segment symbol

       a      automatic (local) variable symbol

       p      function parameter symbol

       z      source file name

       Z      source file line offset

       f      source file name components

       The output is sorted alphabetically.

       Options are:

       -a     Print all symbols; normally only user-defined text, data, and bss segment symbols are printed.

       -g     Print only global (T, L, D, B) symbols.

       -h     Do not print file name headers with output lines.

       -n     Sort according to the address of the symbols.

       -s     Don't sort; print in symbol-table order.

       -u     Print only undefined symbols.

SOURCE

       /sys/src/cmd/nm.c

SEE ALSO

       ar(1), 2l(1), db(1), acid(1), a.out(6)

																	     NM(1)
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