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Try to clarify test documentation for newbies

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See #2773
This commit is contained in:
Fabian Homborg 2016-02-28 17:50:41 +01:00
parent fb5a8a089e
commit 60bd3c809a
1 changed files with 21 additions and 4 deletions
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25
doc_src/test.txt
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@ -12,7 +12,9 @@ Tests the expression given and sets the exit status to 0 if true, and 1 if false
The first form (`test`) is preferred. For compatibility with other shells, the second form is available: a matching pair of square brackets (`[ [EXPRESSION ] ]`).
The following operators are available to examine files and directories:
This test is mostly POSIX-compatible.
\subsection test-files Operators for files and directories
- `-b FILE` returns true if `FILE` is a block device.
@ -48,7 +50,7 @@ The following operators are available to examine files and directories:
- `-x FILE` returns true if `FILE` is marked as executable.
The following operators are available to compare and examine text strings:
\subsection test-strings Operators for text strings
- `STRING1 = STRING2` returns true if the strings `STRING1` and `STRING2` are identical.
@ -58,7 +60,7 @@ The following operators are available to compare and examine text strings:
- `-z STRING` returns true if the length of `STRING` is zero.
The following operators are available to compare and examine numbers:
\subsection test-numbers Operators to compare and examine numbers
- `NUM1 -eq NUM2` returns true if `NUM1` and `NUM2` are numerically equal.
@ -74,7 +76,7 @@ The following operators are available to compare and examine numbers:
Note that only integers are supported. For more complex mathematical operations, including fractions, the `env` program may be useful. Consult the documentation for your operating system.
Expressions can be combined using the following operators:
\subsection test-combinators Operators to combine expressions
- `COND1 -a COND2` returns true if both `COND1` and `COND2` are true.
@ -117,6 +119,21 @@ if test \( -f /foo -o -f /bar \) -a \( -f /baz -o -f /bat \)
end.
\endfish
Numerical comparisons will simply fail if one of the operands is not a number:
\fish
if test 42 -eq "The answer to life, the universe and everything"
echo So long and thanks for all the fish # will not be executed
end
\endfish
A common comparison is with $status:
\fish
if test $status -eq 0
echo "Previous command succeeded"
end
\endfish
\subsection test-standards Standards