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Top Forums Shell Programming and Scripting Equivalent to let command in POSIX shell Post 303030160 by johnprogrammer on Wednesday 6th of February 2019 06:45:32 PM
Old 02-06-2019
Equivalent to let command in POSIX shell

Hi all,

I am learning POSIX shell programming, and the book I read, uses the let command for integer arithmetic.

I have downloaded and use the shellcheck program on Linux.

This programs says:

Code:
In POSIX sh, 'let' is undefined.


See the screenshot attached.


What is the POSIX equivalent of let, for doing arithmetic operations, like:

Code:
let "x=x+5"

Thank you a lot.
Moderator's Comments:
Mod Comment Please use CODE tags (not QUOTE tags) when displaying sample output. Also use CODE tags when displaying sample input and when displaying code segments.
Equivalent to let command in POSIX shell-shellcheckpng

Last edited by Don Cragun; 02-06-2019 at 08:34 PM..
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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