maint: update quoting of "Try `prog --help'" to "Try 'prog --help'"

Automatically adjust both the source (now in only one place)
and all tests that expect the resulting output via this:

git grep -l 'Try.*--help' src/system.h tests \
  | xargs perl -pi -e 's/Try \\?`(\S+ --help)/Try '\''$1/'

15 files changed, 20 insertions, 20 deletions

diff --git a/tests/misc/basename b/tests/misc/basename
index 9006e604e..6bd5e4019 100755
--- a/tests/misc/basename
+++ b/tests/misc/basename
@@ -33,9 +33,9 @@ my $prog = 'basename';
 my @Tests =
     (
      ['fail-1', {ERR => "$prog: missing operand\n"
-       . "Try `$prog --help' for more information.\n"}, {EXIT => '1'}],
+       . "Try '$prog --help' for more information.\n"}, {EXIT => '1'}],
      ['fail-2', qw(a b c), {ERR => "$prog: extra operand `c'\n"
-       . "Try `$prog --help' for more information.\n"}, {EXIT => '1'}],
+       . "Try '$prog --help' for more information.\n"}, {EXIT => '1'}],
 
      ['a', qw(d/f),        {OUT => 'f'}],
      ['b', qw(/d/f),       {OUT => 'f'}],
diff --git a/tests/misc/comm b/tests/misc/comm
index ed567403e..c727f80fc 100755
--- a/tests/misc/comm
+++ b/tests/misc/comm
@@ -58,17 +58,17 @@ my @Tests =
    # invalid missing command line argument (1)
    ['missing-arg1', $inputs[0], {EXIT=>1},
     {ERR => "$prog: missing operand after `a'\n"
-        . "Try `$prog --help' for more information.\n"}],
+        . "Try '$prog --help' for more information.\n"}],
 
    # invalid missing command line argument (both)
    ['missing-arg2', {EXIT=>1},
     {ERR => "$prog: missing operand\n"
-        . "Try `$prog --help' for more information.\n"}],
+        . "Try '$prog --help' for more information.\n"}],
 
    # invalid extra command line argument
    ['extra-arg', @inputs, 'no-such', {EXIT=>1},
     {ERR => "$prog: extra operand `no-such'\n"
-        . "Try `$prog --help' for more information.\n"}],
+        . "Try '$prog --help' for more information.\n"}],
 
    # out-of-order input
    ['ooo', {IN=>{a=>"1\n3"}}, {IN=>{b=>"3\n2"}}, {EXIT=>1},
diff --git a/tests/misc/cut b/tests/misc/cut
index 0114d6545..8c3676ef0 100755
--- a/tests/misc/cut
+++ b/tests/misc/cut
@@ -28,7 +28,7 @@ my $mb_locale = $ENV{LOCALE_FR_UTF8};
   and $mb_locale = 'C';
 
 my $prog = 'cut';
-my $try = "Try \`$prog --help' for more information.\n";
+my $try = "Try '$prog --help' for more information.\n";
 my $from_1 = "$prog: fields and positions are numbered from 1\n$try";
 my $inval = "$prog: invalid byte or field list\n$try";
 my $no_endpoint = "$prog: invalid range with no endpoint: -\n$try";
diff --git a/tests/misc/dirname b/tests/misc/dirname
index 2e6c8cc02..5934b25c7 100755
--- a/tests/misc/dirname
+++ b/tests/misc/dirname
@@ -34,9 +34,9 @@ my $prog = 'dirname';
 my @Tests =
     (
      ['fail-1', {ERR => "$prog: missing operand\n"
-       . "Try `$prog --help' for more information.\n"}, {EXIT => '1'}],
+       . "Try '$prog --help' for more information.\n"}, {EXIT => '1'}],
      ['fail-2', qw(a b), {ERR => "$prog: extra operand `b'\n"
-       . "Try `$prog --help' for more information.\n"}, {EXIT => '1'}],
+       . "Try '$prog --help' for more information.\n"}, {EXIT => '1'}],
 
      ['a', qw(d/f),        {OUT => 'd'}],
      ['b', qw(/d/f),       {OUT => '/d'}],
diff --git a/tests/misc/expr b/tests/misc/expr
index 9cc1f9d4f..be757e2c6 100755
--- a/tests/misc/expr
+++ b/tests/misc/expr
@@ -159,7 +159,7 @@ my @Tests =
      ['fail-b', '9 9', {ERR => "$prog: syntax error\n"},
       {EXIT => 2}],
      ['fail-c', {ERR => "$prog: missing operand\n"
-                 . "Try `$prog --help' for more information.\n"},
+                 . "Try '$prog --help' for more information.\n"},
       {EXIT => 2}],
 
      ['bignum-add', "$big + 1", {OUT => $big_p1}],
diff --git a/tests/misc/factor b/tests/misc/factor
index 6c11c70ab..71f850ae4 100755
--- a/tests/misc/factor
+++ b/tests/misc/factor
@@ -59,7 +59,7 @@ my @Tests =
      ['z', '-1',
       {ERR_SUBST => q!s/'1'/1/!}, # map newer glibc diagnostic to expected.
       {ERR => "$prog: invalid option -- 1\n"
-       . "Try `$prog --help' for more information.\n"},
+       . "Try '$prog --help' for more information.\n"},
       {EXIT => 1}],
      ['cont', 'a 4',
       {OUT => "4: 2 2\n"},
diff --git a/tests/misc/fmt b/tests/misc/fmt
index 29858fe59..ef10e8274 100755
--- a/tests/misc/fmt
+++ b/tests/misc/fmt
@@ -37,7 +37,7 @@ my @Tests =
      ['obs-1', '-c -72',
       {ERR => "fmt: invalid option -- 7; -WIDTH is recognized only when it"
        . " is the first\noption; use -w N instead\n"
-       . "Try `fmt --help' for more information.\n" }, {EXIT => 1}],
+       . "Try 'fmt --help' for more information.\n" }, {EXIT => 1}],
 
      # With --prefix=P, do not remove leading space on lines without the prefix.
      ['pfx-1', qw (-p '>'),
diff --git a/tests/misc/invalid-opt b/tests/misc/invalid-opt
index 68e61df8e..8eae3c275 100755
--- a/tests/misc/invalid-opt
+++ b/tests/misc/invalid-opt
@@ -65,7 +65,7 @@ foreach my $prog (@built_programs)
     $prog eq '['
       and next;
 
-    my $try = "Try \`$prog --help' for more information.\n";
+    my $try = "Try '$prog --help' for more information.\n";
     my $x = $exit_status{$prog};
     defined $x
       or $x = 1;
diff --git a/tests/misc/mktemp b/tests/misc/mktemp
index 1bef533db..40bbe5100 100755
--- a/tests/misc/mktemp
+++ b/tests/misc/mktemp
@@ -57,7 +57,7 @@ my @Tests =
      #
      ['too-many', 'a b',
       {ERR=>"$prog: too many templates\n"
-       . "Try `$prog --help' for more information.\n"}, {EXIT => 1} ],
+       . "Try '$prog --help' for more information.\n"}, {EXIT => 1} ],
      ['too-many-q', '-q a b', {EXIT => 1} ],
 
      ['too-few-x', 'foo.XX', {EXIT => 1},
@@ -164,7 +164,7 @@ my @Tests =
      ['suffix9f', 'aXXXX --suffix=b', {EXIT=>1},
       {ENV=>"POSIXLY_CORRECT=1"},
       {ERR=>"$prog: too many templates\n"
-       . "Try `$prog --help' for more information.\n"}],
+       . "Try '$prog --help' for more information.\n"}],
 
      ['suffix10f', 'aXXb', {EXIT => 1},
       {ERR=>"$prog: too few X's in template `aXXb'\n"}],
diff --git a/tests/misc/printf-cov b/tests/misc/printf-cov
index 892cb0199..c3a6861d6 100755
--- a/tests/misc/printf-cov
+++ b/tests/misc/printf-cov
@@ -19,7 +19,7 @@
 use strict;
 
 my $prog = 'printf';
-my $try = "Try \`$prog --help' for more information.\n";
+my $try = "Try '$prog --help' for more information.\n";
 my $pow_2_31 = 2**31;
 
 # Turn off localization of executable's output.
diff --git a/tests/misc/seq b/tests/misc/seq
index dabdccf4e..05770b0da 100755
--- a/tests/misc/seq
+++ b/tests/misc/seq
@@ -24,7 +24,7 @@ use strict;
 @ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
 
 my $prog = 'seq';
-my $try_help = "Try `$prog --help' for more information.\n";
+my $try_help = "Try '$prog --help' for more information.\n";
 
 my $locale = $ENV{LOCALE_FR_UTF8};
 ! defined $locale || $locale eq 'none'
diff --git a/tests/misc/sort-files0-from b/tests/misc/sort-files0-from
index ebabae362..80ad423ce 100755
--- a/tests/misc/sort-files0-from
+++ b/tests/misc/sort-files0-from
@@ -32,7 +32,7 @@ my @Tests =
    ['f-extra-arg', '--files0-from=- no-such', {IN=>"a"}, {EXIT=>2},
     {ERR => "$prog: extra operand `no-such'\n"
         . "file operands cannot be combined with --files0-from\n"
-        . "Try `$prog --help' for more information.\n"}
+        . "Try '$prog --help' for more information.\n"}
     ],
 
    # missing input file
diff --git a/tests/misc/tsort b/tests/misc/tsort
index 0bc2a2ca2..88fcec50a 100755
--- a/tests/misc/tsort
+++ b/tests/misc/tsort
@@ -55,7 +55,7 @@ my @Tests =
    ['only-one', {IN => {f => ""}}, {IN => {g => ""}},
     {EXIT => 1},
     {ERR => "tsort: extra operand `g'\n"
-     . "Try `tsort --help' for more information.\n"}],
+     . "Try 'tsort --help' for more information.\n"}],
   );
 
 my $save_temps = $ENV{DEBUG};
diff --git a/tests/misc/uniq b/tests/misc/uniq
index 5083be559..84e1c48e5 100755
--- a/tests/misc/uniq
+++ b/tests/misc/uniq
@@ -21,7 +21,7 @@ use strict;
 my $limits = getlimits ();
 
 my $prog = 'uniq';
-my $try = "Try \`$prog --help' for more information.\n";
+my $try = "Try '$prog --help' for more information.\n";
 
 # Turn off localization of executable's output.
 @ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
diff --git a/tests/misc/wc-files0-from b/tests/misc/wc-files0-from
index 4d21b7bf4..ac2211345 100755
--- a/tests/misc/wc-files0-from
+++ b/tests/misc/wc-files0-from
@@ -32,7 +32,7 @@ my @Tests =
    ['f-extra-arg', '--files0-from=- no-such', {IN=>"a"}, {EXIT=>1},
     {ERR => "$prog: extra operand `no-such'\n"
         . "file operands cannot be combined with --files0-from\n"
-        . "Try `$prog --help' for more information.\n"}
+        . "Try '$prog --help' for more information.\n"}
     ],
 
    # missing input file