sbase

commit 7250fb69686b4c0131e4cef3904003fb1124851e
parent dfc94e0221c0b830e49800e25e15c4ccad281b2c
Author: Mattias Andrée <maandree@kth.se>
Date:   Wed, 30 Mar 2016 01:16:27 +0200

printenv: exit status is 2 on failure

This provides a reliable and portable way to
test whether an environment variable is defined.

(Of course, if you are using glibc you may get
false positives if you include a = in the query.)

Signed-off-by: Mattias Andrée <maandree@kth.se>

Diffstat:
M
printenv.1
 | 
11
++++++++++-
M
printenv.c
 | 
2
+-

2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/printenv.1 b/printenv.1
@@ -1,4 +1,4 @@
-.Dd 2015-10-08
+.Dd 2016-03-30
 .Dt PRINTENV 1
 .Os sbase
 .Sh NAME
@@ -16,5 +16,14 @@ is given. Otherwise,
 prints only the value of each
 .Ar var
 one per line in the order specified.
+.SH EXIT STATUS
+.Bl -tag -width Ds
+.It 0
+Successful completion.
+.It 1
+One or more queried variables were not found.
+.It > 1
+An error occurred.
+.El
 .Sh SEE ALSO
 .Xr env 1
diff --git a/printenv.c b/printenv.c
@@ -26,5 +26,5 @@ main(int argc, char *argv[])
 		}
 	}
 
-	return fshut(stdout, "<stdout>") || ret;
+	return fshut(stdout, "<stdout>") ? 2 : ret;
 }