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<title>QCMDEXC program</title>
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<h1 class="topictitle1">QCMDEXC program</h1>
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<div><p>Execute Command (QCMDEXC) is an IBM-supplied program that runs
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a single command. </p>
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<div class="section"> <div class="p"> This command is used to activate another command: <ul><li>From within a high-level language (HLL) program.</li>
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<li>From within a CL procedure.</li>
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<li>From a program where it is not known at compile time what command is to
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be run or what parameters are to be used.</li>
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</ul>
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</div>
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<p>The QCMDEXC program is called from within the HLL or CL procedure
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or program. The command that is to be run is passed as a parameter on the
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CALL command.<br /><img src="rbafn558.gif" alt="The QCMDEXC program is called from within the HLL or CL procedure or program. The command that is to be run is passed as a parameter on the CALL command." /><br /></p>
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<p>After the command runs,
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control returns to your HLL or CL procedure or program.</p>
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<p>The command
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runs as if it was not in a program. Therefore, variables cannot be used on
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the command because values cannot be returned by the command to CL variables.
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Additionally, commands that can only be used in CL procedures or programs
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cannot be run by the QCMDEXC program. The format of the call to the QCMDEXC
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program is the following: </p>
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<pre>CALL PGM(QCMDEXC) PARM(command command-length)</pre>
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<p>Enter the command you wish to run as a character string on
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the first parameter. You must specify the command library. </p>
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<pre>CALL PGM(QCMDEXC ) PARM('QSYS/CRTLIB LIB(TEST)' 22)</pre>
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<p>Remember that you must enclose the command in apostrophes if
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it contains blanks. The maximum length of the character string is 6000 characters;
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never count the delimiters (the apostrophes ) as part of the string. The length
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that is specified as the second value on the PARM parameter is the length
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of the character string that is passed as the command. Length must be a packed
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decimal value of length 15 with 5 decimal positions.</p>
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<p>Thus, to replace
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a library list, the call to the QCMDEXC program would look like this: </p>
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<pre>CALL PGM(QCMDEXC) PARM('CHGLIBL LIBL(QGPL NEWLIB QTEMP)' 31)</pre>
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<p>It is possible to code this statement into the HLL or CL program
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to replace the library list when the program runs. The QCMDEXC program does
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not provide runtime flexibility when used this way.</p>
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<p>Providing runtime
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flexibility is accomplished by: </p>
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<ol><li>Substituting variables for the constants in the parameter list, and</li>
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<li>Specifying the values for the variables in the call to the HLL or CL program.</li>
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</ol>
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<div class="p">For instance, examine the following figure: <div class="fignone"><span class="figcap">Figure 1. Example of
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Call PGM</span><br /><img src="rbafn500.gif" alt="Example of Call PGM" /><br /></div>
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</div>
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<p>The command length, passed to the QCMDEXC program on the second
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parameter, is the maximum length of the passed command string. Should the
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command string be passed as a quoted string, the command length is exactly
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the length of the quoted string. Should the command string be passed in a
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variable, the command length is the length of the CL variable. It is not necessary
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to reduce the command length to the actual length of the command string in
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the variable, although it is permissible to do so.</p>
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<p>Not all commands
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can be run using the QCMDEXC program. The command passed on a call to the
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QCMDEXC program must be valid within the current environment (interactive
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or batch) in which the call is being made. The command cannot be one of the
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following: </p>
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<ul><li>An input stream control command (BCHJOB, ENDBCHJOB, and DATA)</li>
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<li>A command that can be used only in a CL program</li>
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</ul>
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<p>You can precede the CL command with a question mark (?) to request
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prompting or use selective prompting when you call QCMDEXC in an interactive
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job.</p>
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<p>If an error is detected while a command is being processed through
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the QCMDEXC program, an escape message is sent. You can monitor for this escape
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message in your CL procedure or program using the <span class="cmdname">Monitor Message
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(MONMSG)</span> command.</p>
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<p>If a syntax error is detected, message CPF0006
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is sent. If an error is detected during the processing of a command, any escape
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message sent by the command is returned by the QCMDEXC program. You monitor
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for messages from commands run through the QCMDEXC program in the same way
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you monitor for messages from commands contained in CL procedures and programs.</p>
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<p>See
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the appropriate high level language reference book for information on how
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high level language programs handle errors on calls.</p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="excdb.htm">QCMDEXC program with DBCS data</a></strong><br />
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You can use QCMDEXC to request double-byte character set (DBCS) input data to be entered with a command.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="clpgcmdAPIs.htm" title="This describes application programming interfaces (APIs) and programs that can be used when working with commands.">Use command-related APIs</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="workv.htm" title="CL procedures consist of CL commands, and the commands themselves consist of the command statement, parameters, and parameter values.">Use variables</a></div>
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<div><a href="msghd.htm" title="Predefined messages are stored in a message file.">Define message descriptions</a></div>
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<div><a href="secpr.htm" title="You can request to prompt for selected parameters within a command.">Use selective prompting for CL commands</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../apis/qcmdexc.htm">Execute Commands (QCMDEXC) API</a></div>
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</div>
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</div>
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