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Operating Systems OS X (Apple) Creating An Executable On The Fly... Post 302897708 by wisecracker on Tuesday 15th of April 2014 02:02:50 PM
Old 04-15-2014
Creating An Executable On The Fly...

Hi all...

Had an idea tonight which could really enhance shell scripting for me.
Yes I am aware there could be difficulties but......

Creating a C script inside the shell script to do a task, (a simple text print to stdout in
this example), compiling it on the fly, making sure it is executable and then calling it
as part of the script...

Of course one would have to develop and fully test the C code first before inserting it
into a shell script and there may be some difficulties on fairly complex C scripts to
insert into said shell script but nevertheless this looks mighty interesting...

This is using OSX 10.7.5, default bash terminal and for OSX users XCode will need
to be installed from the Apple site before "gcc" can be used as Apple do not include
this part of the OS as standard. It is free and takes little time to get it...

Not tried on Linux and other *NIX flavours but there is no reason why it will not work.
Code:
#!/bin/bash
# Embed_C.sh
> /tmp/cscript.c
> /tmp/cscript
echo "Create a C script..."
echo '/* Embed a C script and compile on the fly. */
#include<stdio.h>
main()
{
    printf("A simple text line as a test...\n");
}' > /tmp/cscript.c
cd /tmp
echo "Compile this new C script as the default a.out..."
gcc cscript.c
mv a.out cscript
echo "Rename and ensure it is executable..."
chmod 755 cscript
echo "Now call it..."
echo ""
./cscript
echo ""
echo "Done!..."
exit 0

Results:-
Code:
Last login: Tue Apr 15 18:58:08 on ttys000
AMIGA:barrywalker~> ./Embed_C.sh
Create a C script...
Compile this new C script as the default a.out...
Rename and ensure it is executable...
Now call it...

A simple text line as a test...

Done!...
AMIGA:barrywalker~> _

Enjoy the supreme flexibility of the shell...
 

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exit(1) 							   User Commands							   exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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