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Diffstat (limited to 'doc/backtick.html')
| -rw-r--r-- | doc/backtick.html | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/doc/backtick.html b/doc/backtick.html index 7bdc037..bdcd785 100644 --- a/doc/backtick.html +++ b/doc/backtick.html @@ -29,7 +29,7 @@ another program. </p> <pre> - backtick [ -i ] [ -n ] <em>variable</em> { <em>prog1...</em> } <em>prog2...</em> + backtick [ -i | -D <em>default</em> ] [ -n ] <em>variable</em> { <em>prog1...</em> } <em>prog2...</em> </pre> <ul> @@ -45,9 +45,13 @@ output as a value. </li> <h2> Options </h2> <ul> - <li> <tt>-i</tt> : insist. If <em>prog1</em> exits non-zero, + <li> <tt>-i</tt> : insist. If <em>prog1</em> crashes or exits non-zero, <tt>backtick</tt> exits with the same exit code (or 111 if <em>prog1</em> -crashed for some reason). Without this option, <tt>backtick</tt> execs into +crashed). </li> + <li> <tt>-D <em>default</em></tt> : default value. If +<em>prog1</em> crashes or exits non-zero, <em>default</em> is used as +<em>variable</em>'s value. If neither the <tt>-i</tt> nor the <tt>-D</tt> +option have been given, <tt>backtick</tt> execs into <em>prog2...</em> no matter what <em>prog1</em> does, with the null word as <em>variable</em>'s value if <em>prog1</em> didn't write anything before dying. </li> @@ -58,7 +62,7 @@ output. </li> <h2> Notes </h2> <ul> - <li> You can start <em>prog2...</em> with "import <em>variable</em> unexport <em>variable</em>" + <li> You can start <em>prog2...</em> with "import -u <em>variable</em>" to perform variable substitution. </li> </ul> |