z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

sh — Invoke a shell
Format
Description
[r]sh [±abCefhiKkLmnPprtuvx] [±o option] [cmd_file [argument ...]]
[r]sh –S [±abCefhiKkLmnPprtuvx] [±o option] [cmd_file [argument ...]]
[r]sh –c cmdstring [±abCefhiKkLmnPprtuvx] [±o option] [cmd_name [argument
...]]
[r]sh –s [±abCefhikLmnPprtuvx] [±o option] [argument ...]
sh contains the following topics and subtopics:
v Options and invocation
v Options
v Command syntax
v Reserved-Word Commands
v Command execution
v Quoting
v Directory substitution
v Parameter substitution
v Arithmetic substitution
v Command substitution
v File descriptors and redirection
v Filename generation
v Variables
v Shell execution environments
v Built-in commands
v Examples
v Shell Variables
v Files
v Localization
v Exit Values
v Messages
Subtopics dealing with substitution and interpretation of input appear in the order in
which the shell performs those substitutions and interpretations.
Much of what the shell can do is provided through such built-in commands as cd
and alias.
Options and Invocation
The z/OS shell, based on the KornShell, is upward-compatible with the Bourne
shell.
Normally you invoke the shell by logging in. You can also invoke the shell by typing
an explicit sh command. Some people find it useful to copy the sh file into a file
named rsh. If you invoke the shell under the name rsh, the shell operates in
restricted mode. This mode is described in connection with –r.
If you invoke the shell with a name that begins with the – character, it is a login
shell. (You can also get a login shell if you invoke the shell with the –L option.) A
login shell begins by running the file /etc/profile.It then runs $HOME/.profile using
the . command (see dot). If HOME is not set, the shell searches the working
directory for:
.profile
sh
Chapter 2. Shell command descriptions 549