t: convert fgrep usage to "grep -F"

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>

Author: sgn

t/t3700-add.sh

@@ -291,7 +291,7 @@ test_expect_success BSLASHPSPEC "git add 'fo\\[ou\\]bar' ignores foobar" '
 	git reset --hard &&
 	touch fo\[ou\]bar foobar &&
 	git add '\''fo\[ou\]bar'\'' &&
-	git ls-files fo\[ou\]bar | fgrep fo\[ou\]bar &&
+	git ls-files fo\[ou\]bar | grep -F fo\[ou\]bar &&
 	! ( git ls-files foobar | grep foobar )
 '
 

t/t7003-filter-branch.sh

@@ -49,7 +49,7 @@ test_expect_success 'result is really identical' '
 test_expect_success 'rewrite bare repository identically' '
 	(git config core.bare true && cd .git &&
 	 git filter-branch branch > filter-output 2>&1 &&
-	! fgrep fatal filter-output)
+	! grep fatal filter-output)
 '
 git config core.bare false
 test_expect_success 'result is really identical' '
@@ -506,7 +506,7 @@ test_expect_success 'rewrite repository including refs that point at non-commit
 	git tag -a -m "tag to a tree" treetag $new_tree &&
 	git reset --hard HEAD &&
 	git filter-branch -f -- --all >filter-output 2>&1 &&
-	! fgrep fatal filter-output
+	! grep fatal filter-output
 '
 
 test_expect_success 'filter-branch handles ref deletion' '

t/t9133-git-svn-nested-git-repo.sh

@@ -35,7 +35,7 @@ test_expect_success 'SVN-side change outside of .git' '
 		echo b >> a &&
 		svn_cmd commit -m "SVN-side change outside of .git" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change outside of .git"
+		svn_cmd log -v | grep -F "SVN-side change outside of .git"
 	)
 '
 
@@ -59,7 +59,7 @@ test_expect_success 'SVN-side change inside of .git' '
 		svn_cmd add --force .git &&
 		svn_cmd commit -m "SVN-side change inside of .git" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change inside of .git"
+		svn_cmd log -v | grep -F "SVN-side change inside of .git"
 	)
 '
 
@@ -82,7 +82,7 @@ test_expect_success 'SVN-side change in and out of .git' '
 		git commit -m "add a inside an SVN repo" &&
 		svn_cmd commit -m "SVN-side change in and out of .git" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change in and out of .git"
+		svn_cmd log -v | grep -F "SVN-side change in and out of .git"
 	)
 '
 

t/t9134-git-svn-ignore-paths.sh

@@ -43,7 +43,7 @@ test_expect_success 'init+fetch an SVN repository with ignored www directory' '
 test_expect_success 'verify ignore-paths config saved by clone' '
 	(
 	    cd g &&
-	    git config --get svn-remote.svn.ignore-paths | fgrep "www"
+	    git config --get svn-remote.svn.ignore-paths | grep www
 	)
 '
 
@@ -53,7 +53,7 @@ test_expect_success 'SVN-side change outside of www' '
 		echo b >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change outside of www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change outside of www"
+		svn_cmd log -v | grep "SVN-side change outside of www"
 	)
 '
 
@@ -85,7 +85,7 @@ test_expect_success 'SVN-side change inside of ignored www' '
 		echo zaq >> www/test_www.txt &&
 		svn_cmd commit -m "SVN-side change inside of www/test_www.txt" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change inside of www/test_www.txt"
+		svn_cmd log -v | grep -F "SVN-side change inside of www/test_www.txt"
 	)
 '
 
@@ -118,7 +118,7 @@ test_expect_success 'SVN-side change in and out of ignored www' '
 		echo ygg >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change in and out of ignored www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change in and out of ignored www"
+		svn_cmd log -v | grep "SVN-side change in and out of ignored www"
 	)
 '
 

t/t9140-git-svn-reset.sh

@@ -43,7 +43,7 @@ test_expect_success 'fetch fails on modified hidden file' '
 	  git svn find-rev refs/remotes/git-svn > ../expect &&
 	  test_must_fail git svn fetch 2> ../errors &&
 	  git svn find-rev refs/remotes/git-svn > ../expect2 ) &&
-	fgrep "not found in commit" errors &&
+	grep "not found in commit" errors &&
 	test_cmp expect expect2
 '
 
@@ -59,7 +59,7 @@ test_expect_success 'refetch succeeds not ignoring any files' '
 	( cd g &&
 	  git svn fetch &&
 	  git svn rebase &&
-	  fgrep "mod hidden" hid/hid.txt
+	  grep "mod hidden" hid/hid.txt
 	)
 '
 

t/t9147-git-svn-include-paths.sh

@@ -45,7 +45,7 @@ test_expect_success 'init+fetch an SVN repository with included qqq directory' '
 test_expect_success 'verify include-paths config saved by clone' '
 	(
 	    cd g &&
-	    git config --get svn-remote.svn.include-paths | fgrep "qqq"
+	    git config --get svn-remote.svn.include-paths | grep qqq
 	)
 '
 
@@ -55,7 +55,7 @@ test_expect_success 'SVN-side change outside of www' '
 		echo b >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change outside of www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change outside of www"
+		svn_cmd log -v | grep "SVN-side change outside of www"
 	)
 '
 
@@ -87,7 +87,7 @@ test_expect_success 'SVN-side change inside of ignored www' '
 		echo zaq >> www/test_www.txt &&
 		svn_cmd commit -m "SVN-side change inside of www/test_www.txt" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change inside of www/test_www.txt"
+		svn_cmd log -v | grep "SVN-side change inside of www/test_www.txt"
 	)
 '
 
@@ -120,7 +120,7 @@ test_expect_success 'SVN-side change in and out of included qqq' '
 		echo ygg >> qqq/test_qqq.txt &&
 		svn_cmd commit -m "SVN-side change in and out of ignored www" &&
 		svn_cmd up &&
-		svn_cmd log -v | fgrep "SVN-side change in and out of ignored www"
+		svn_cmd log -v | grep "SVN-side change in and out of ignored www"
 	)
 '