tests: use "compare exp out", not "compare out exp"

Likewise, when an empty file is expected, use "compare /dev/null out",
not "compare out /dev/null". I.e., specify the expected/desired contents
via the first file name.  Prompted by a suggestion from Bruno Haible
in http://thread.gmane.org/gmane.comp.gnu.grep.bugs/4020/focus=29154

Run these commands:

    git grep -l -E 'compare [^ ]+ exp' \
      |xargs perl -pi -e 's/(compare) (\S+) (exp\S*)/$1 $3 $2/'
    git grep -l -E 'compare [^ ]+ /dev/null' \
      |xargs perl -pi -e 's/(compare) (\S+) (\/dev\/null)/$1 $3 $2/'

* tests/chgrp/no-x: As above.
* tests/chmod/no-x: Likewise.
* tests/chmod/silent: Likewise.
* tests/chmod/thru-dangling: Likewise.
* tests/chown/basic: Likewise.
* tests/chown/deref: Likewise.
* tests/chown/preserve-root: Likewise.
* tests/cp/abuse: Likewise.
* tests/cp/backup-is-src: Likewise.
* tests/cp/cp-a-selinux: Likewise.
* tests/cp/cp-mv-enotsup-xattr: Likewise.
* tests/cp/fail-perm: Likewise.
* tests/cp/into-self: Likewise.
* tests/cp/proc-zero-len: Likewise.
* tests/cp/src-base-dot: Likewise.
* tests/cp/thru-dangling: Likewise.
* tests/dd/reblock: Likewise.
* tests/dd/unblock-sync: Likewise.
* tests/du/2g: Likewise.
* tests/du/8gb: Likewise.
* tests/du/basic: Likewise.
* tests/du/bigtime: Likewise.
* tests/du/deref-args: Likewise.
* tests/du/exclude: Likewise.
* tests/du/files0-from-dir: Likewise.
* tests/du/hard-link: Likewise.
* tests/du/inacc-dest: Likewise.
* tests/du/inacc-dir: Likewise.
* tests/du/long-sloop: Likewise.
* tests/du/max-depth: Likewise.
* tests/du/move-dir-while-traversing: Likewise.
* tests/du/no-deref: Likewise.
* tests/du/no-x: Likewise.
* tests/du/one-file-system: Likewise.
* tests/du/slash: Likewise.
* tests/du/trailing-slash: Likewise.
* tests/install/strip-program: Likewise.
* tests/ln/hard-backup: Likewise.
* tests/ls/block-size: Likewise.
* tests/ls/color-clear-to-eol: Likewise.
* tests/ls/color-dtype-dir: Likewise.
* tests/ls/color-norm: Likewise.
* tests/ls/dangle: Likewise.
* tests/ls/dired: Likewise.
* tests/ls/file-type: Likewise.
* tests/ls/follow-slink: Likewise.
* tests/ls/infloop: Likewise.
* tests/ls/m-option: Likewise.
* tests/ls/no-arg: Likewise.
* tests/ls/recursive: Likewise.
* tests/ls/rt-1: Likewise.
* tests/ls/stat-dtype: Likewise.
* tests/ls/stat-failed: Likewise.
* tests/ls/stat-free-symlinks: Likewise.
* tests/ls/x-option: Likewise.
* tests/misc/arch: Likewise.
* tests/misc/cat-buf: Likewise.
* tests/misc/cat-proc: Likewise.
* tests/misc/chcon: Likewise.
* tests/misc/csplit: Likewise.
* tests/misc/df-P: Likewise.
* tests/misc/fmt-long-line: Likewise.
* tests/misc/groups-dash: Likewise.
* tests/misc/groups-version: Likewise.
* tests/misc/head-pos: Likewise.
* tests/misc/nl: Likewise.
* tests/misc/od-N: Likewise.
* tests/misc/od-multiple-t: Likewise.
* tests/misc/od-x8: Likewise.
* tests/misc/printf: Likewise.
* tests/misc/printf-hex: Likewise.
* tests/misc/pwd-option: Likewise.
* tests/misc/readlink-fp-loop: Likewise.
* tests/misc/runcon-no-reorder: Likewise.
* tests/misc/seq-long-double: Likewise.
* tests/misc/sort-NaN-infloop: Likewise.
* tests/misc/sort-benchmark-random: Likewise.
* tests/misc/sort-debug-keys: Likewise.
* tests/misc/sort-float: Likewise.
* tests/misc/sort-merge-fdlimit: Likewise.
* tests/misc/sort-unique-segv: Likewise.
* tests/misc/stat-hyphen: Likewise.
* tests/misc/stat-slash: Likewise.
* tests/misc/stdbuf: Likewise.
* tests/misc/sum-sysv: Likewise.
* tests/misc/tac-2-nonseekable: Likewise.
* tests/misc/tac-continue: Likewise.
* tests/misc/tr-case-class: Likewise.
* tests/misc/truncate-fail-diag: Likewise.
* tests/misc/wc-files0: Likewise.
* tests/mkdir/selinux: Likewise.
* tests/mv/backup-dir: Likewise.
* tests/mv/backup-is-src: Likewise.
* tests/mv/diag: Likewise.
* tests/mv/dir2dir: Likewise.
* tests/mv/dup-source: Likewise.
* tests/mv/force: Likewise.
* tests/mv/hard-verbose: Likewise.
* tests/mv/i-link-no: Likewise.
* tests/mv/into-self: Likewise.
* tests/mv/into-self-2: Likewise.
* tests/mv/into-self-3: Likewise.
* tests/mv/mv-special-1: Likewise.
* tests/mv/part-fail: Likewise.
* tests/mv/perm-1: Likewise.
* tests/mv/sticky-to-xpart: Likewise.
* tests/mv/trailing-slash: Likewise.
* tests/rm/rm1: Likewise.
* tests/rm/rm2: Likewise.
* tests/rm/cycle: Likewise.
* tests/rm/dir-no-w: Likewise.
* tests/rm/dir-nonrecur: Likewise.
* tests/rm/fail-2eperm: Likewise.
* tests/rm/fail-eacces: Likewise.
* tests/rm/i-never: Likewise.
* tests/rm/inaccessible: Likewise.
* tests/rm/interactive-always: Likewise.
* tests/rm/interactive-once: Likewise.
* tests/rm/isatty: Likewise.
* tests/rm/one-file-system: Likewise.
* tests/rm/rm3: Likewise.
* tests/rm/rm5: Likewise.
* tests/rm/unread2: Likewise.
* tests/rm/v-slash: Likewise.
* tests/sample-test: Likewise.
* tests/split/b-chunk: Likewise.
* tests/split/fail: Likewise.
* tests/split/l-chunk: Likewise.
* tests/split/lines: Likewise.
* tests/split/r-chunk: Likewise.
* tests/split/suffix-length: Likewise.
* tests/tail-2/big-4gb: Likewise.
* tests/tail-2/follow-name: Likewise.
* tests/tail-2/follow-stdin: Likewise.
* tests/tail-2/pipe-f: Likewise.
* tests/tail-2/pipe-f2: Likewise.
* tests/tail-2/start-middle: Likewise.
* tests/touch/60-seconds: Likewise.
* tests/touch/fail-diag: Likewise.
* tests/touch/not-owner: Likewise.
* tests/touch/relative: Likewise.

18 files changed, 23 insertions, 23 deletions

diff --git a/tests/du/2g b/tests/du/2g
index 280ba30f8..fe5876774 100755
--- a/tests/du/2g
+++ b/tests/du/2g
@@ -64,6 +64,6 @@ cat <<\EOF > exp || fail=1
 ~2M
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/8gb b/tests/du/8gb
index ab283e42e..22d09af50 100755
--- a/tests/du/8gb
+++ b/tests/du/8gb
@@ -48,6 +48,6 @@ cat <<\EOF > exp
 8589934592	big
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/basic b/tests/du/basic
index 3cb3c0d99..db75ee927 100755
--- a/tests/du/basic
+++ b/tests/du/basic
@@ -55,7 +55,7 @@ $a	a       # size of dir entry, a
 $tot	a
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 # Perform this test only if "." is on a local file system.
 # Otherwise, it would fail e.g., on an NFS-mounted Solaris ZFS file system.
@@ -83,7 +83,7 @@ $s2	d/sub
 $d1	d           # d + d/1; don't count the dir. entry for d/sub
 EOF
 
-  compare out exp || fail=1
+  compare exp out || fail=1
 fi
 
 Exit $fail
diff --git a/tests/du/bigtime b/tests/du/bigtime
index b33b80126..dd69457c3 100755
--- a/tests/du/bigtime
+++ b/tests/du/bigtime
@@ -45,7 +45,7 @@ du --time future >out 2>err || fail=1
 # Map the number of blocks to 0.
 sed 's/^[0-9][0-9]*/0/' out > k && mv k out
 
-compare out exp || fail=1
+compare exp out || fail=1
 compare err err_ok || fail=1
 
 Exit $fail
diff --git a/tests/du/deref-args b/tests/du/deref-args
index 474f7d06c..3c3e97425 100755
--- a/tests/du/deref-args
+++ b/tests/du/deref-args
@@ -43,6 +43,6 @@ slink/
 64	slink-to-64k
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/exclude b/tests/du/exclude
index 7403f5d04..87346fba5 100755
--- a/tests/du/exclude
+++ b/tests/du/exclude
@@ -53,6 +53,6 @@ a/x
 a/x/y
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/files0-from-dir b/tests/du/files0-from-dir
index fc1e1844c..1d996c152 100755
--- a/tests/du/files0-from-dir
+++ b/tests/du/files0-from-dir
@@ -33,7 +33,7 @@ for prog in du wc; do
   # The diagnostic string is usually "Is a directory" (ENOTDIR),
   # but accept a different string or errno value.
   sed 's/dir:.*/dir:/' err > k; mv k err
-  compare err exp || fail=1
+  compare exp err || fail=1
 done
 
 Exit $fail
diff --git a/tests/du/hard-link b/tests/du/hard-link
index 71cbf51d9..4113898ec 100755
--- a/tests/du/hard-link
+++ b/tests/du/hard-link
@@ -59,6 +59,6 @@ dir/f_
 dir
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/inacc-dest b/tests/du/inacc-dest
index fac7e0ede..96231a013 100755
--- a/tests/du/inacc-dest
+++ b/tests/du/inacc-dest
@@ -51,6 +51,6 @@ EOF
 sed "s,/c/j': ,/c': ," out > t && mv t out
 sed 's,cannot access,cannot read directory,' out > t && mv t out
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/inacc-dir b/tests/du/inacc-dir
index c160fbbf5..638fc340a 100755
--- a/tests/du/inacc-dir
+++ b/tests/du/inacc-dir
@@ -27,7 +27,7 @@ chmod 0 a/sub || fail=1
 # Expect failure, ignore diagnostics.
 du -s a > out 2> /dev/null && fail=1
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 # Same as above, but don't use -s, so we print
 # an entry for the unreadable "sub", too.
@@ -37,6 +37,6 @@ chmod 0 a/sub || fail=1
 # Expect failure, ignore diagnostics.
 du -k a > out 2> /dev/null && fail=1
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/long-sloop b/tests/du/long-sloop
index 6c1d8d5de..09bd2c1c6 100755
--- a/tests/du/long-sloop
+++ b/tests/du/long-sloop
@@ -67,6 +67,6 @@ sed "s, .1/s/s/s/[/s]*',," out1 > out || fail=1
 
 echo "du: cannot access: $too_many" > exp || fail=1
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/max-depth b/tests/du/max-depth
index 6edc73e6e..e165d3278 100755
--- a/tests/du/max-depth
+++ b/tests/du/max-depth
@@ -25,14 +25,14 @@ du --max-depth=2 a > out 2>err || fail=1
 
 # Remove the sizes.  They vary between file systems.
 cut -f2- out > k && mv k out
-compare out exp || fail=1
-compare err /dev/null || fail=1
+compare exp out || fail=1
+compare /dev/null err || fail=1
 
 # Repeat, but use -d 1.
 printf 'a/b\na\n' > exp || framework_failure_
 du -d 1 a > out 2>err || fail=1
 cut -f2- out > k && mv k out
-compare out exp || fail=1
-compare err /dev/null || fail=1
+compare exp out || fail=1
+compare /dev/null err || fail=1
 
 Exit $fail
diff --git a/tests/du/move-dir-while-traversing b/tests/du/move-dir-while-traversing
index d0969fecc..29a65d8d5 100755
--- a/tests/du/move-dir-while-traversing
+++ b/tests/du/move-dir-while-traversing
@@ -91,6 +91,6 @@ test $? = 1 || fail=1
 # check for the new diagnostic
 printf "du: fts_read failed: $t/3/a/b: No such file or directory\n" > exp \
   || fail=1
-compare err exp || fail=1
+compare exp err || fail=1
 
 Exit $fail
diff --git a/tests/du/no-deref b/tests/du/no-deref
index 09a1dcc41..731eb8ec5 100755
--- a/tests/du/no-deref
+++ b/tests/du/no-deref
@@ -28,6 +28,6 @@ cat <<\EOF > exp
 slink
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/no-x b/tests/du/no-x
index e45f317e0..366818be9 100755
--- a/tests/du/no-x
+++ b/tests/du/no-x
@@ -44,6 +44,6 @@ cat <<EOF > exp
 $prog: \`d/no-x': Permission denied
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/one-file-system b/tests/du/one-file-system
index 8a57c9934..7195838bd 100755
--- a/tests/du/one-file-system
+++ b/tests/du/one-file-system
@@ -35,6 +35,6 @@ y/z
 y
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/slash b/tests/du/slash
index c87dd3f3f..f796cc047 100755
--- a/tests/du/slash
+++ b/tests/du/slash
@@ -28,6 +28,6 @@ cat <<\EOF > exp
 /
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail
diff --git a/tests/du/trailing-slash b/tests/du/trailing-slash
index 7c97ccec9..e22c9d628 100755
--- a/tests/du/trailing-slash
+++ b/tests/du/trailing-slash
@@ -42,6 +42,6 @@ slink/1
 slink
 EOF
 
-compare out exp || fail=1
+compare exp out || fail=1
 
 Exit $fail