GNU bug report logs - #12964
[PATCH] printenv: -n option added -- show names of variables.

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Package: coreutils; Severity: wishlist; Reported by: Van de Bugger <van.de.bugger@HIDDEN>; Keywords: patch; dated Fri, 23 Nov 2012 00:31:02 UTC; Maintainer for coreutils is bug-coreutils@HIDDEN.
Severity set to 'wishlist' from 'normal' Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#12964: [PATCH] printenv: -n option added -- show names of
 variables.
To: Assaf Gordon <assafgordon@HIDDEN>,
 Van de Bugger <van.de.bugger@HIDDEN>, 12964 <at> debbugs.gnu.org
References: <1353624141.3382.3.camel@HIDDEN>
 <f6e24283-b604-fe93-92af-62817607c9ef@HIDDEN>
From: Bernhard Voelker <mail@HIDDEN>
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Date: Wed, 10 Oct 2018 11:03:05 +0200
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On 10/9/18 11:33 PM, Assaf Gordon wrote:
> With your patch, using "printenv -n VARNAME" adds
> the variable name to the output. e.g.:
> 
>     $ printenv HOME
>     /home/gordon
> 
>     $ printenv -n HOME
>     HOME=/home/gordon
> 
> From a cursory look this seems like a non-standard extension
> that is not available in any other 'printenv' implementations.

This feature looks like it should be possible to write out the current settings
to a file which could later be sourced in:

  printenv -n VAR > file

and in another shell (to get VAR back):

  . file

I'm afraid this is problematic once the value of a variable starts to have
funny characters, even a simple blank ' ' already screws things up.
For this kind of save/restore, -n would need to do correct shell quoting.

Have a nice day,
Berny




Information forwarded to bug-coreutils@HIDDEN:
bug#12964; Package coreutils. Full text available.

Message received at 12964 <at> debbugs.gnu.org:


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Subject: Re: bug#12964: [PATCH] printenv: -n option added -- show names of
 variables.
To: Van de Bugger <van.de.bugger@HIDDEN>, 12964 <at> debbugs.gnu.org
References: <1353624141.3382.3.camel@HIDDEN>
From: Assaf Gordon <assafgordon@HIDDEN>
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Date: Tue, 9 Oct 2018 15:33:32 -0600
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(Triaging old bugs)

Hello,

On 22/11/12 03:42 PM, Van de Bugger wrote:
> Subject: [PATCH] printenv: -n option added -- show names of variables.
> 
> * src/printenv.c: -n option added -- show names of variables.
> ---
>   src/printenv.c | 17 +++++++++++++----
>   1 file changed, 13 insertions(+), 4 deletions(-)

Thank you for the patch. It seem it have slipped between the cracks long
ago - sorry about that.

So summarize:

With your patch, using "printenv -n VARNAME" adds
the variable name to the output. e.g.:

     $ printenv HOME
     /home/gordon

     $ printenv -n HOME
     HOME=/home/gordon

 From a cursory look this seems like a non-standard extension
that is not available in any other 'printenv' implementations.

Do you have any specific use-cases for this functionality
(that can't be easily done with existing methods) ?

I'm inclined to close it as "wontfix" - but will wait few days
in case others want to chime in with other opinions.

regards,
  - assaf




Information forwarded to bug-coreutils@HIDDEN:
bug#12964; Package coreutils. Full text available.

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Message-ID: <1353624141.3382.3.camel@HIDDEN>
Subject: [PATCH] printenv: -n option added -- show names of variables.
From: Van de Bugger <van.de.bugger@HIDDEN>
To: bug-coreutils@HIDDEN
Date: Fri, 23 Nov 2012 02:42:21 +0400
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From 50aefa315b50b151a2192168fa46e9a311c06147 Mon Sep 17 00:00:00 2001
From: Van de Bugger <van.de.bugger@HIDDEN>
Date: Fri, 23 Nov 2012 02:38:48 +0400
Subject: [PATCH] printenv: -n option added -- show names of variables.

* src/printenv.c: -n option added -- show names of variables.
---
 src/printenv.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/printenv.c b/src/printenv.c
index 5c01f8d..b4583bd 100644
--- a/src/printenv.c
+++ b/src/printenv.c
@@ -49,6 +49,7 @@ static struct option const longopts[] =
   {"null", no_argument, NULL, '0'},
   {GETOPT_HELP_OPTION_DECL},
   {GETOPT_VERSION_OPTION_DECL},
+  {"names", no_argument, NULL, 'n'},
   {NULL, 0, NULL, 0}
 };
 
@@ -69,6 +70,9 @@ If no VARIABLE is specified, print name and value
pairs for them all.\n\
       fputs (_("\
   -0, --null     end each output line with 0 byte rather than newline\n
\
 "), stdout);
+      fputs (_("\
+  -n, --names    print also names of the specified environment
VARIABLE(s)\n\
+"), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);
       printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
@@ -81,11 +85,12 @@ int
 main (int argc, char **argv)
 {
   char **env;
-  char *ep, *ap;
+  char *ep, *ap, *bp;
   int i;
   bool ok;
   int optc;
   bool opt_nul_terminate_output = false;
+  bool opt_show_names = false;
 
   initialize_main (&argc, &argv);
   set_program_name (argv[0]);
@@ -96,13 +101,16 @@ main (int argc, char **argv)
   initialize_exit_failure (PRINTENV_FAILURE);
   atexit (close_stdout);
 
-  while ((optc = getopt_long (argc, argv, "+iu:0", longopts, NULL)) !=
-1)
+  while ((optc = getopt_long (argc, argv, "+iu:0n", longopts, NULL)) !=
-1)
     {
       switch (optc)
         {
         case '0':
           opt_nul_terminate_output = true;
           break;
+        case 'n':
+          opt_show_names = true;
+          break;
         case_GETOPT_HELP_CHAR;
         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
         default:
@@ -130,13 +138,14 @@ main (int argc, char **argv)
 
           for (env = environ; *env; ++env)
             {
-              ep = *env;
+              bp = ep = *env;
               ap = argv[i];
               while (*ep != '\0' && *ap != '\0' && *ep++ == *ap++)
                 {
                   if (*ep == '=' && *ap == '\0')
                     {
-                      printf ("%s%c", ep + 1,
+                      printf ("%s%c",
+                              opt_show_names ? bp : ep + 1,
                               opt_nul_terminate_output ? '\0' : '\n');
                       matched = true;
                       break;
-- 
1.7.11.7







Acknowledgement sent to Van de Bugger <van.de.bugger@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-coreutils@HIDDEN. Full text available.
Report forwarded to bug-coreutils@HIDDEN:
bug#12964; Package coreutils. Full text available.
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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.