[AmigaOS 3.1 Command Reference/IF]
Format: IF [NOT] [WARN] [ERROR] [FAIL] [<string> EQ|GT|GE <string>]
[VAL] [EXISTS <filename>]
Template: NOT/S, WARN/S, ERROR/S, FAIL/S, EQ/K, GT/K, GE/K, VAL/S,
Purpose: To evaluate conditional operations in script files.
In a script file, IF, when its conditional is true, carries out all the
subsequent commands until an ENDIF or ELSE command is found. When the
conditional is not true, execution skips directly to the ENDIF or to an
ELSE. The conditions and commands in IF and ELSE blocks can span more than
one line before their corresponding ENDlFs.
ELSE is optional, and nested IFs jump to the nearest ENDIF.
The additional keywords are as follows:
Reverses the interpretation of the result.
True if previous return code is greater than or equal to 5.
True if previous return code is greater than or equal to 10; only available
if you set FAILAT to greater than 10.
True if previous return code is greater than or equal to 20; only available
if you set FAILAT to greater than 20.
<a> EQ <b>
True if the text of a and b is identical (disregarding case).
True if the file exists.
If more than one of the three condition-flag keywords (WARN, ERROR, FAIL)
are given, the one with the lowest value is used.
IF supports the GT (greater than) and GE (greater than or equal to)
comparisons. Normally, the comparisons are performed as string comparisons.
However, if the VAL option is specified, the comparison is a numeric
You can use NOT GE for LT and NOT GT for LE.
You can use local or global variables with IF by prefacing the variable name
with a $ character.
IF EXISTS Work/Prog
ECHO "It's not here"
If the file Work/Prog exists in the current directory, then AmigaDOS
displays it. Otherwise, AmigaDOS displays the message "It's not here" and
continues after the ENDIF.
ECHO "No error"
If the previous command produced a return code greater than or equal to 10,
then AmigaDOS skips over the ECHO command to the errlab label.
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