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, [ - test for a condition
SYNOPSIS
test expr
[ expr ]
OPTIONS
(none)
EXAMPLES
test -r file # See if file is readable
DESCRIPTION
Test checks to see if files exist, are readable, etc. and returns an exit status of zero if true and nonzero if false. The legal operators
are
-r file true if the file is readable
-w file true if the file is writable
-x file true if the file is executable
-f file true if the file is not a directory
-d file true if the file is a directory
-s file true if the file exists and has a size > 0
-t fd true if file descriptor fd (default 1) is a terminal
-z s true if the string s has zero length
-n s true if the string s has nonzero length
s1 = s2 true if the strings s1 and s2 are identical
s1 != s2 true if the strings s1 and s2 are different
m -eq m true if the integers m and n are numerically equal
The operators -gt, -ge, -ne, -le, and -lt may be used as well. These operands may be combined with -a (Boolean and), -o (Boolean or), !
(negation). The priority of -a is higher than that of -o. Parentheses are permitted, but must be escaped to keep the shell from trying to
interpret them.
SEE ALSO
expr(1), sh(1).
TEST(1)