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Full Discussion: calling a c function from shell
Top Forums UNIX for Dummies Questions & Answers calling a c function from shell Post 498 by Neo on Wednesday 6th of December 2000 08:51:55 PM
Old 12-06-2000
me2unix does a great job of stating the main difference between C program and shell programs.

C is a compiled and executed language.

Shells are C programs written to interpret commands without compiling them.

The same holds true for PERL, PYTHON, PHP and other C programs that are compiled.

So, just look at SHELLs as C programs that have built-in functions and the ability to call other C programs. If you need a C program feature in a SHELL, you simply write a C program, compile it and execute it within the SHELL environment, as me2unix explains.

In fact, entire programs are often written via SHELLS as folks familiar with PHP, PERL, etc. Even the Java Virtual Machine (JVM) is a 'kind of SHELL' program if you think about it. The JVM is just a 'special class of shell'.

This was a good question by the thread starter and a good answer by m2unix.
 

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LEARN ABOUT LINUX

envsubst

ENVSUBST(1)								GNU							       ENVSUBST(1)

NAME

       envsubst - substitutes environment variables in shell format strings

SYNOPSIS

       envsubst [OPTION] [SHELL-FORMAT]

DESCRIPTION

       Substitutes the values of environment variables.

   Operation mode:
       -v, --variables
	      output the variables occurring in SHELL-FORMAT

   Informative output:
       -h, --help
	      display this help and exit

       -V, --version
	      output version information and exit

       In  normal  operation  mode, standard input is copied to standard output, with references to environment variables of the form $VARIABLE or
       ${VARIABLE} being replaced with the corresponding values.  If a SHELL-FORMAT is given, only those environment variables that are referenced
       in SHELL-FORMAT are substituted; otherwise all environment variables references occurring in standard input are substituted.

       When --variables is used, standard input is ignored, and the output consists of the environment variables that are referenced in SHELL-FOR-
       MAT, one per line.

AUTHOR

       Written by Bruno Haible.

REPORTING BUGS

       Report bugs to <bug-gnu-gettext@gnu.org>.

COPYRIGHT

       Copyright (C) 2003-2007 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for envsubst is maintained as a Texinfo manual.  If the info and envsubst programs are properly  installed  at  your
       site, the command

	      info envsubst

       should give you access to the complete manual.

GNU gettext-runtime 0.18.1					     June 2010							       ENVSUBST(1)
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