qshell
iSeries QSHELL is a command line interpreter (shell) running on the IBM iSeries computer platform. Qshell is based on POSIX and X/Open standards. IBM created the Qshell interpreter primarily to provide support for the Java Development Kit (JDK) on their iSeries line of computers.[citation needed] The Qshell interpreter can be used interactively or for running shell scripts.
Differences from other shells
Qshell differs from other shell environments in a number of ways:[1]
- No support for job control
- No support for the <> redirection operator (though the
QIBM_QSH_CMD_OUTPUTenvironment variable can be used to redirect output[2]) - No support for command line editing (Command retrieval and editing is handled at an abstraction level between user and shell.)
- The number of command-line arguments is limited to 255
Compared to PASE, another shell on the iSeries computer
According to IBM, QSHELL is a “UNIX-like” interface built over OS/400. The commands you issue point to programs in a “QSHELL” library. To use QSHELL, key STRQSH or QSH on an iSeries command line, or pass a command string to the QSH command, or use UNIXCMD, an open-source utility created by Scott Klement which allows the execution of QShell commands through an RPG special file.[3]
PASE is a “real” UNIX—it is actually AIX. It looks similar to QSHELL, but doesn’t have some of the limitations built into QSHELL. To use PASE, CALL QP2TERM.
Further reading
- Holt, Ted. Qshell for iSeries. ISBN 1-58347-046-8.
See also
References
- ^ iSeries Information Center
- ^ Calling QSHELL commands from an i5/OS command line
- ^ "It's Easy to Run PHP, QShell, and PASE Tools from RPG". 12 November 2009. Retrieved 12 April 2016.