02-02-2019
Please be aware that
csh is not well represented nor received (for good reasons) in these fora. Even I had to search this forum's man pages. Would be worthwhile reading for you as well.
Quote:
if (expr) command If expr (an expression, as described under Expressions) evaluates true, then command is executed.
.
.
.
File inquiry operators
Some of these operators perform true/false tests on files and related objects. They are of the form -op file, where op is one of
.
.
.
e Existence
./wind explicitly denotes the current working directory to search for file "wind" whereas
wind searches in the current working directory (pointed to by
$PWD).
Last edited by RudiC; 02-02-2019 at 06:20 PM..
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TEST(1) General Commands Manual TEST(1)
NAME
test - condition command
SYNOPSIS
test expr
DESCRIPTION
test evaluates the expression expr, and if its value is true then returns zero exit status; otherwise, a non zero exit status is returned.
test returns a non zero exit if there are no arguments.
The following primitives are used to construct expr.
-r file true if the file exists and is readable.
-w file true if the file exists and is writable.
-f file true if the file exists and is not a directory.
-d file true if the file exists and is a directory.
-s file true if the file exists and has a size greater than zero.
-t [ fildes ]
true if the open file whose file descriptor number is fildes (1 by default) is associated with a terminal device.
-z s1 true if the length of string s1 is zero.
-n s1 true if the length of the string s1 is nonzero.
s1 = s2 true if the strings s1 and s2 are equal.
s1 != s2 true if the strings s1 and s2 are not equal.
s1 true if s1 is not the null string.
n1 -eq n2
true if the integers n1 and n2 are algebraically equal. Any of the comparisons -ne, -gt, -ge, -lt, or -le may be used in place of
-eq.
These primaries may be combined with the following operators:
! unary negation operator
-a binary and operator
-o binary or operator
( expr )
parentheses for grouping.
-a has higher precedence than -o. Notice that all the operators and flags are separate arguments to test. Notice also that parentheses
are meaningful to the Shell and must be escaped.
SEE ALSO
sh(1), find(1)
TEST(1)