tests: remove nearly all remaining backticks

* tests/rm/isatty: Remove now-unneeded "# `" line.
* tests/misc/ls-time: Likewise.
* tests/misc/date-sec: Remove stray "`" in comment.
* tests/du/long-sloop: Likewise.
* tests/mv/part-symlink: Replace multi-line `...` by $(...).
* tests/mv/sticky-to-xpart: Likewise.
* tests/rm/fail-2eperm: Likewise.
* tests/ls/nameless-uid: Likewise.
* tests/cp/perm: Likewise.
* tests/cp/preserve-gid: Likewise.
* tests/cp/same-file: Likewise.

3 files changed, 13 insertions, 13 deletions

diff --git a/tests/cp/perm b/tests/cp/perm
index eb3925da2..a93df7182 100755
--- a/tests/cp/perm
+++ b/tests/cp/perm
@@ -55,13 +55,13 @@ for u in 31 37 2; do
                 ;;
               cp:*:no)
                 test $u = 37 &&
-                  expected_perms=`
+                  expected_perms=$(
                     echo $expected_perms | sed 's/.....$/-----/'
-                  `
+                  )
                 test $u = 31 &&
-                  expected_perms=`
+                  expected_perms=$(
                     echo $expected_perms | sed 's/..\(..\).$/--\1-/'
-                  `
+                  )
                 ;;
             esac
             test _$actual_perms = _$expected_perms || exit 1
diff --git a/tests/cp/preserve-gid b/tests/cp/preserve-gid
index 6f371c3fb..746c57a60 100755
--- a/tests/cp/preserve-gid
+++ b/tests/cp/preserve-gid
@@ -52,24 +52,24 @@ t0() {
   fi
 }
 
-nameless_uid=`$PERL -le '
+nameless_uid=$($PERL -le '
   foreach my $i (1000..16*1024-1)
     {
       getpwuid $i or (print $i), exit
     }
-'`
-nameless_gid1=`$PERL -le '
+')
+nameless_gid1=$($PERL -le '
   foreach my $i (1000..16*1024)
     {
       getgrgid $i or (print $i), exit
     }
-'`
-nameless_gid2=`$PERL -le '
+')
+nameless_gid2=$($PERL -le '
   foreach my $i ('"$nameless_gid1"'+1..16*1024)
     {
       getgrgid $i or (print $i), exit
     }
-'`
+')
 
 if test -z "$nameless_uid" \
     || test -z "$nameless_gid1" \
diff --git a/tests/cp/same-file b/tests/cp/same-file
index dbd4d01b6..2ca7bf6ba 100755
--- a/tests/cp/same-file
+++ b/tests/cp/same-file
@@ -102,10 +102,10 @@ for args in 'foo symlink' 'symlink foo' 'foo foo' 'sl1 sl2' 'foo hardlink'; do
           ' _err
         fi
         # Strip off all but the file names.
-        ls=`ls -gG --ignore=_err . \
-            | sed \
+        ls=$(ls -gG --ignore=_err . \
+             | sed \
                 -e '/^total /d' \
-                -e 's/^[^ ]*  *[^ ]*  *[^ ]*  *[^ ]*  *[^ ]*  *[^ ]*  *//'`
+                -e 's/^[^ ]*  *[^ ]*  *[^ ]*  *[^ ]*  *[^ ]*  *[^ ]*  *//')
         echo "($ls)"
         # Make sure the original is unchanged and that
         # the destination is a copy.