t: convert egrep usage to "grep -E"

Despite POSIX states that:

> The old egrep and fgrep commands are likely to be supported for many
> years to come as implementation extensions, allowing historical
> applications to operate unmodified.

GNU grep 3.8 started to warn[1]:

> The egrep and fgrep commands, which have been deprecated since
> release 2.5.3 (2007), now warn that they are obsolescent and should
> be replaced by grep -E and grep -F.

Prepare for their removal in the future.

[1]: https://lists.gnu.org/archive/html/info-gnu/2022-09/msg00001.html

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/perf/run

@@ -232,10 +232,10 @@ then
 	)
 elif test -n "$GIT_PERF_SUBSECTION"
 then
-	egrep "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names >/dev/null ||
+	grep -E "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names >/dev/null ||
 		die "subsection '$GIT_PERF_SUBSECTION' not found in '$GIT_PERF_CONFIG_FILE'"
 
-	egrep "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names | while read -r subsec
+	grep -E "^$GIT_PERF_SUBSECTION\$" "$TEST_RESULTS_DIR"/run_subsections.names | while read -r subsec
 	do
 		(
 			GIT_PERF_SUBSECTION="$subsec"

t/t1304-default-acl.sh

@@ -18,7 +18,7 @@ test_expect_success 'checking for a working acl setup' '
 	if setfacl -m d:m:rwx -m u:root:rwx . &&
 	   getfacl . | grep user:root:rwx &&
 	   touch should-have-readable-acl &&
-	   getfacl should-have-readable-acl | egrep "mask::?rw-"
+	   getfacl should-have-readable-acl | grep -E "mask::?rw-"
 	then
 		test_set_prereq SETFACL
 	fi
@@ -34,7 +34,7 @@ check_perms_and_acl () {
 	getfacl "$1" > actual &&
 	grep -q "user:root:rwx" actual &&
 	grep -q "user:${LOGNAME}:rwx" actual &&
-	egrep "mask::?r--" actual > /dev/null 2>&1 &&
+	grep -E "mask::?r--" actual > /dev/null 2>&1 &&
 	grep -q "group::---" actual || false
 }
 

t/t3702-add-edit.sh

@@ -100,7 +100,7 @@ EOF
 
 echo "#!$SHELL_PATH" >fake-editor.sh
 cat >> fake-editor.sh <<\EOF
-egrep -v '^index' "$1" >orig-patch &&
+grep -E -v '^index' "$1" >orig-patch &&
 mv -f patch "$1"
 EOF
 

t/t4014-format-patch.sh

@@ -1457,7 +1457,7 @@ append_signoff()
 	C=$(git commit-tree HEAD^^{tree} -p HEAD) &&
 	git format-patch --stdout --signoff $C^..$C >append_signoff.patch &&
 	sed -n -e "1,/^---$/p" append_signoff.patch |
-		egrep -n "^Subject|Sign|^$"
+		grep -E -n "^Subject|Sign|^$"
 }
 
 test_expect_success 'signoff: commit with no body' '
@@ -2274,10 +2274,10 @@ test_expect_success 'format-patch --base with --attach' '
 test_expect_success 'format-patch --attach cover-letter only is non-multipart' '
 	test_when_finished "rm -fr patches" &&
 	git format-patch -o patches --cover-letter --attach=mimemime --base=HEAD~ -1 &&
-	! egrep "^--+mimemime" patches/0000*.patch &&
-	egrep "^--+mimemime$" patches/0001*.patch >output &&
+	! grep -E "^--+mimemime" patches/0000*.patch &&
+	grep -E "^--+mimemime$" patches/0001*.patch >output &&
 	test_line_count = 2 output &&
-	egrep "^--+mimemime--$" patches/0001*.patch >output &&
+	grep -E "^--+mimemime--$" patches/0001*.patch >output &&
 	test_line_count = 1 output
 '
 

t/t5320-delta-islands.sh

@@ -134,7 +134,7 @@ test_expect_success 'island core places core objects first' '
 	    repack -adfi &&
 	git verify-pack -v .git/objects/pack/*.pack |
 	cut -d" " -f1 |
-	egrep "$root|$two" >actual &&
+	grep -E "$root|$two" >actual &&
 	test_cmp expect actual
 '
 

t/t7527-builtin-fsmonitor.sh

@@ -939,9 +939,9 @@ test_expect_success CASE_INSENSITIVE_FS 'case insensitive+preserving' '
 	# directories and files that we touched.  We may or may not get a
 	# trailing slash on modified directories.
 	#
-	egrep "^event: abc/?$"       ./insensitive.trace &&
-	egrep "^event: abc/def/?$"   ./insensitive.trace &&
-	egrep "^event: abc/def/xyz$" ./insensitive.trace
+	grep -E "^event: abc/?$"       ./insensitive.trace &&
+	grep -E "^event: abc/def/?$"   ./insensitive.trace &&
+	grep -E "^event: abc/def/xyz$" ./insensitive.trace
 '
 
 # The variable "unicode_debug" is defined in the following library
@@ -983,20 +983,20 @@ test_expect_success !UNICODE_COMPOSITION_SENSITIVE 'Unicode nfc/nfd' '
 	then
 		# We should have seen NFC event from OS.
 		# We should not have synthesized an NFD event.
-		egrep    "^event: nfc/c_${utf8_nfc}/?$" ./unicode.trace &&
-		egrep -v "^event: nfc/c_${utf8_nfd}/?$" ./unicode.trace
+		grep -E    "^event: nfc/c_${utf8_nfc}/?$" ./unicode.trace &&
+		grep -E -v "^event: nfc/c_${utf8_nfd}/?$" ./unicode.trace
 	else
 		# We should have seen NFD event from OS.
 		# We should have synthesized an NFC event.
-		egrep "^event: nfc/c_${utf8_nfd}/?$" ./unicode.trace &&
-		egrep "^event: nfc/c_${utf8_nfc}/?$" ./unicode.trace
+		grep -E "^event: nfc/c_${utf8_nfd}/?$" ./unicode.trace &&
+		grep -E "^event: nfc/c_${utf8_nfc}/?$" ./unicode.trace
 	fi &&
 
 	# We assume UNICODE_NFD_PRESERVED.
 	# We should have seen explicit NFD from OS.
 	# We should have synthesized an NFC event.
-	egrep "^event: nfd/d_${utf8_nfd}/?$" ./unicode.trace &&
-	egrep "^event: nfd/d_${utf8_nfc}/?$" ./unicode.trace
+	grep -E "^event: nfd/d_${utf8_nfd}/?$" ./unicode.trace &&
+	grep -E "^event: nfd/d_${utf8_nfc}/?$" ./unicode.trace
 '
 
 test_done

t/t7701-repack-unpack-unreachable.sh

@@ -35,7 +35,7 @@ test_expect_success '-A with -d option leaves unreachable objects unpacked' '
 	git repack -A -d -l &&
 	# verify objects are packed in repository
 	test 3 = $(git verify-pack -v -- .git/objects/pack/*.idx |
-		   egrep "^($fsha1|$csha1|$tsha1) " |
+		   grep -E "^($fsha1|$csha1|$tsha1) " |
 		   sort | uniq | wc -l) &&
 	git show $fsha1 &&
 	git show $csha1 &&
@@ -49,7 +49,7 @@ test_expect_success '-A with -d option leaves unreachable objects unpacked' '
 	git repack -A -d -l &&
 	# verify objects are retained unpacked
 	test 0 = $(git verify-pack -v -- .git/objects/pack/*.idx |
-		   egrep "^($fsha1|$csha1|$tsha1) " |
+		   grep -E "^($fsha1|$csha1|$tsha1) " |
 		   sort | uniq | wc -l) &&
 	git show $fsha1 &&
 	git show $csha1 &&

t/t9001-send-email.sh

@@ -1519,7 +1519,7 @@ test_expect_success $PREREQ 'asks about and fixes 8bit encodings' '
 	grep "do not declare a Content-Transfer-Encoding" stdout &&
 	grep email-using-8bit stdout &&
 	grep "Which 8bit encoding" stdout &&
-	egrep "Content|MIME" msgtxt1 >actual &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
 	test_cmp content-type-decl actual
 '
 
@@ -1530,7 +1530,7 @@ test_expect_success $PREREQ 'sendemail.8bitEncoding works' '
 	git send-email --from=author@example.com --to=nobody@example.com \
 			--smtp-server="$(pwd)/fake.sendmail" \
 			email-using-8bit >stdout &&
-	egrep "Content|MIME" msgtxt1 >actual &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
 	test_cmp content-type-decl actual
 '
 
@@ -1545,7 +1545,7 @@ test_expect_success $PREREQ 'sendemail.8bitEncoding in .git/config overrides --g
 	git send-email --from=author@example.com --to=nobody@example.com \
 			--smtp-server="$(pwd)/fake.sendmail" \
 			email-using-8bit >stdout &&
-	egrep "Content|MIME" msgtxt1 >actual &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
 	test_cmp content-type-decl actual
 '
 
@@ -1557,7 +1557,7 @@ test_expect_success $PREREQ '--8bit-encoding overrides sendemail.8bitEncoding' '
 			--smtp-server="$(pwd)/fake.sendmail" \
 			--8bit-encoding=UTF-8 \
 			email-using-8bit >stdout &&
-	egrep "Content|MIME" msgtxt1 >actual &&
+	grep -E "Content|MIME" msgtxt1 >actual &&
 	test_cmp content-type-decl actual
 '
 

t/t9814-git-p4-rename.sh

@@ -216,7 +216,7 @@ test_expect_success 'detect copies' '
 # variable exists, which allows admins to disable the "p4 move" command.
 test_lazy_prereq P4D_HAVE_CONFIGURABLE_RUN_MOVE_ALLOW '
 	p4 configure show run.move.allow >out &&
-	egrep ^run.move.allow: out
+	grep -E ^run.move.allow: out
 '
 
 # If move can be disabled, turn it off and test p4 move handling

t/t9815-git-p4-submit-fail.sh

@@ -417,8 +417,8 @@ test_expect_success 'cleanup chmod after submit cancel' '
 		! p4 fstat -T action text &&
 		test_path_is_file text+x &&
 		! p4 fstat -T action text+x &&
-		ls -l text | egrep ^-r-- &&
-		ls -l text+x | egrep ^-r-x
+		ls -l text | grep -E ^-r-- &&
+		ls -l text+x | grep -E ^-r-x
 	)
 '
 

t/test-lib-functions.sh

@@ -897,7 +897,7 @@ test_path_is_symlink () {
 test_dir_is_empty () {
 	test "$#" -ne 1 && BUG "1 param"
 	test_path_is_dir "$1" &&
-	if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
+	if test -n "$(ls -a1 "$1" | grep -E -v '^\.\.?$')"
 	then
 		echo "Directory '$1' is not empty, it contains:"
 		ls -la "$1"