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Full Discussion: Return Code to shell script
Top Forums Shell Programming and Scripting Return Code to shell script Post 303014453 by Don Cragun on Monday 12th of March 2018 08:30:43 PM
Old 03-12-2018
Quote:
Originally Posted by usrrenny
Thanks all for replying.

I have to use :$(can't use any other code for suppress output).
Is there a way to get return code while using :$
NO!

As you have been told by ctac_ and by wisecracker, the exit code from the : command is zero. Always zero. No matter what comes on the line after the leading :, the exit code from that command line will be zero.

And, NO! you do not have to use the : command to suppress output from a command substitution. And, with what you have shown us there is no reason to use command substitution at all.

If we knew what you were trying to do (instead of how you think you need to do it), we might be able to make suggestions that would meet your needs. The suggestions ctac_ and wisecracker supplied seem to meet your requirements as they have been stated:
  1. run your script named return.sh,
  2. discard any output sent to standard output by return.sh, and
  3. print the exit code returned by return.sh.
Although the code suggested by ctac_ more correctly represents the output that would be produced by the : command with a command substitution that failed. The : command redirects output directed to standard output by a command substitution to /dev/null, but it does not discard output directed to standard error output by a command substitution like the code suggested by wisecracker does.
This User Gave Thanks to Don Cragun For This Post:
wisecracker
 

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LEARN ABOUT CENTOS

tcl_substobj

Tcl_SubstObj(3) 					      Tcl Library Procedures						   Tcl_SubstObj(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_SubstObj - perform substitutions on Tcl objects

SYNOPSIS

       #include <tcl.h>

       Tcl_Obj *
       Tcl_SubstObj(interp, objPtr, flags)

ARGUMENTS

       Tcl_Interp *interp (in)		  Interpreter in which to execute Tcl scripts and lookup variables.  If an error occurs, the interpreter's
					  result is modified to hold an error message.

       Tcl_Obj *objPtr (in)		  A Tcl object containing the string to perform substitutions on.

       int flags (in)			  ORed combination of flag bits that specify which substitutions to  perform.	The  flags  TCL_SUBST_COM-
					  MANDS,  TCL_SUBST_VARIABLES and TCL_SUBST_BACKSLASHES are currently supported, and TCL_SUBST_ALL is pro-
					  vided as a convenience for the common case where all substitutions are desired.
_________________________________________________________________

DESCRIPTION

       The Tcl_SubstObj function is used to perform substitutions on strings in the fashion of the subst command.  It gets the value of the string
       contained  in  objPtr  and  scans  it,  copying	characters and performing the chosen substitutions as it goes to an output object which is
       returned as the result of the function.	In the event of an error occurring during the execution of a command or variable substitution, the
       function returns NULL and an error message is left in interp's result.

       Three kinds of substitutions are supported.  When the TCL_SUBST_BACKSLASHES bit is set in flags, sequences that look like backslash substi-
       tutions for Tcl commands are replaced by their corresponding character.

       When the TCL_SUBST_VARIABLES bit is set in flags, sequences that look like variable substitutions for Tcl commands are replaced by the con-
       tents of the named variable.

       When the TCL_SUBST_COMMANDS bit is set in flags, sequences that look like command substitutions for Tcl commands are replaced by the result
       of evaluating that script.  Where an uncaught "continue exception" occurs during the evaluation of a command substitution, an empty  string
       is  substituted for the command.  Where an uncaught "break exception" occurs during the evaluation of a command substitution, the result of
       the whole substitution on objPtr will be truncated at the point immediately before the start of the command substitution, and no characters
       will be added to the result or substitutions performed after that point.

SEE ALSO

       subst(n)

KEYWORDS

       backslash substitution, command substitution, variable substitution

Tcl									8.4							   Tcl_SubstObj(3)
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