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10 Qshell Interpreter (qsh) – The fg or bg built-in utilities. – Using the Suspend key (typically z) to send the SIGTSTP signal to the foreground process group. – Using the Stop key (typically s) to send the SIGSTOP signal to the foreground process group. – Using the Restart key (typically q) to send the SIGCONT signal to the foreground process group. – Using the Interrupt key (typically c) to send the SIGINT signal to the foreground process group. As an alternative, you can use SysReq 2 from an interactive shell session to send the SIGINT signal to the shell interpreter process and any currently running child processes. v There is no support for the End-of-file key (typically d). As an alternative, use a here-document (page 21) to redirect text entered at the command line to standard input of a utility. v The file /dev/null is not a “bit-bucket” but a regular file. Many scripts redirect output to /dev/null when it is not necessary to save the output. A script that uses this technique does not need to be changed but the /dev/null file can grow very large and should be periodically removed. qsh uses the file /dev/qsh-stdin-null to redirect standard input to a zero-length file. v The verbose option is ignored when the stdin option is not set. v When calling a command, you can pass a maximum of 255 parameters to the command. v When using path name expansion with some case insensitive file systems, you must use upper case characters in the pattern. For example, to list all of the program objects in the QSHELL library you should use this command: ls /qsys.lib/qshell.lib/*.PGM. [ Legal | AS/400 Glossary ]
Chapter 3. Command Language Quoting qsh is a program that: v reads input from either a file or a terminal, v breaks the input into tokens, v parses the input into simple and compound commands, v performs various expansions on each command, v performs redirection of input and output, v runs the commands, and v optionally waits for the commands to complete. qsh implements a command language that has flow control constructs, variables, and functions. The interpretative language is common to both interactive and non-interactive use (shell scripts). So the same commands that are entered at an interactive command line can also be put in a file and the file can be run directly by qsh. For more information about particular features of qsh, see the following topics: v Quoting (including the escape character, literal quotes, and grouping quotes) v Parameters (including positional parameters and special parameters) v Variables (including variables set and variables used by qsh) v Word expansions (including tilde expansion, parameter expansion, command substitution, arithmetic expansion, field splitting, path name expansion (i.e. wild carding), and quote removal) v Redirection (including here-documents) v Using commands (including pipelines, lists, and compound commands) [ Legal | AS/400 Glossary ] Use quoting to remove the special meaning of certain characters to qsh. You can use: v The escape character (backslash) to remove the special meaning of the following character with the exception of . If a follows the backslash, qsh interprets it as a line continuation. For example, \$ removes the special meaning of the dollar sign. v Literal (or single) quotes (’...’) to remove the special meaning of all characters except the single quote. v Grouping (or double) quotes (“...”) to remove the special meaning of all characters except dollar sign ($), backquote (′), and backslash (\). The backslash retains its special meaning as an escape character only when it is followed by a dollar sign ($), backquote (′), double quote (“), backslash (\), or . [ Legal | AS/400 Glossary ] © Copyright IBM Corp. 1998, 1999 11
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Page 46 and 47: Utilities for defining aliases The
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Description Options 60 Qshell Inter
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Environment Variables Exit Status R
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Related Information print - Write o
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Description Actions Options 78 Qshe
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Exit Status Examples Notes 80 Qshel
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For more information about the java
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jar - Archive Java files Ignored op
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Description Options Operands Exit s
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kill - Terminate or signal processe
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Exit status Examples v 0 when succe
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wait - Wait for process completion
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Description Options Operands Exit s
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Options Operands Exit status Relate
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unset - Unset values of variables a
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Exit status v 0 when successful. [
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Description Operands Exit Status Ex
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true - Return true value Synopsis D
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Exit Status Examples 106 Qshell Int
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expr 10 = 10 [ Legal | AS/400 Gloss
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Exit Status Examples -t Mark every
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Error Conditions Related Informatio
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Authorities Return Value Error Cond
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128 Qshell Interpreter (qsh) int c;
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130 Qshell Interpreter (qsh) } /* G
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USER(QSHSVR) AUT(*USE) GRTOBJAUT OB
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