Hand Held Products Dolphin 7200, Руководство пользователя

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A P P E N D I X F G S D O S C O M M A N D S
170
ECHO
The ECHO command has two functions; namely, control of the ECHO flag, and
displaying messages in batch files. ECHO mode controls the command processor's
echoing of commands in batch files. If ECHO mode is on, then commands read from
batch files are automatically echoed to the screen before they are executed. If ECHO
mode is off, then commands are not echoed as they are executed. To display the current
ECHO flag status, use the ECHO command without any parameters. To display a
message from a batch file, use the ECHO command with a non-empty string to be
displayed. The special form of the ECHO command with a period (“.”) immediately
following the word ECHO (no intervening space) causes a blank line to be echoed.
Syntax:
ECHO [ONlOFFlstring]
EXIT
The EXIT command terminates the current command shell and reverts control to the
previous shell, provided that the current command shell is not the first one loaded in the
system. The very first shell cannot be terminated with EXIT. If executed from a batch
file, EXIT will terminate the batch file in a controlled manner causing control to be
transferred to the keyboard user.
Syntax:
EXIT
GOTO
The GOTO command causes the command processor to start executing commands that
follow the specified label, in the current batch file. Labels can be inserted anywhere in
batch files, and take the following form: “: label”.
Syntax: GOTO label
IF
The IF command causes a command to be executed if (or if NOT) a condition is TRUE.
Syntax:
IF [NOT] ERRORLEVEL n statement
IF [NOT] EXIST filename statement