Your message dated Thu, 22 Mar 2007 18:27:26 -0400
with message-id <[EMAIL PROTECTED]>
and subject line Bug#413473: /bin/which: fails with directories beginning with ~
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--- Begin Message ---
Package: debianutils
Version: 2.17
Severity: normal
Tags: patch
Hello,
An element like ~/bin in the PATH variable is not searched by which
because the test is [ -f "$ELEMENT/$PROGRAM" ] and there is no tilde
expansion within double quotes.
I propose the attached patch for replacing "~" by "$HOME" when an
element begins with "~/".
-- System Information:
Debian Release: 4.0
APT prefers testing
APT policy: (650, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18
Locale: [EMAIL PROTECTED], [EMAIL PROTECTED] (charmap=ISO-8859-15)
Versions of packages debianutils depends on:
ii coreutils 5.97-5.3 The GNU core utilities
ii libc6 2.3.6.ds1-11 GNU C Library: Shared libraries
ii mktemp 1.5-2 Makes unique filenames for tempora
debianutils recommends no packages.
-- no debconf information
--- /bin/which 2006-07-25 20:04:28.000000000 +0200
+++ ./which 2007-02-23 13:57:13.000000000 +0100
@@ -34,6 +34,9 @@
;;
*)
for ELEMENT in $PATH; do
+ case "$ELEMENT" in
+ "~"/*) ELEMENT="$HOME""${ELEMENT:1}" ;;
+ esac
if [ -z "$ELEMENT" ]; then
ELEMENT=.
fi
--- End Message ---
--- Begin Message ---
> Does this mean that tilde expansion is not POSIX-conformant ?
> I thought it was, since it is performed by dash.
It is. This is what POSIX says about tilde expansion:
| A "tilde-prefix" consists of an unquoted tilde character at the
| beginning of a word, followed by all of the characters preceding the
| first unquoted slash in the word, or all the characters in the word if
| there is no slash. In an assignment (see the Base Definitions volume of
| IEEE Std 1003.1-2001, Section 4.21, Variable Assignment), multiple
| tilde-prefixes can be used: at the beginning of the word (that is,
| following the equal sign of the assignment), following any unquoted
| colon, or both. A tilde-prefix in an assignment is terminated by the
| first unquoted colon or slash. If none of the characters in the
| tilde-prefix are quoted, the characters in the tilde-prefix following
| the tilde are treated as a possible login name from the user database. A
| portable login name cannot contain characters outside the set given in
| the description of the LOGNAME environment variable in the Base
| Definitions volume of IEEE Std 1003.1-2001, Section 8.3, Other
| Environment Variables. If the login name is null (that is, the
| tilde-prefix contains only the tilde), the tilde-prefix is replaced by
| the value of the variable HOME . If HOME is unset, the results are
| unspecified. Otherwise, the tilde-prefix shall be replaced by a pathname
| of the initial working directory associated with the login name obtained
| using the getpwnam() function as defined in the System Interfaces volume
| of IEEE Std 1003.1-2001. If the system does not recognize the login
| name, the results are undefined.
So this command
PATH=/usr/bin:/bin:~/bin
should set PATH to equal
/usr/bin:/bin:/home/clint/bin
but
PATH="~/bin:~:~rudolph/bin"
echo $PATH
should echo simply
~/bin:~:~rudolph/bin
and no further expansion thereof.
Hope this helps.
--- End Message ---
