1 files changed, 38 insertions, 0 deletions
diff --git a/tests/misc/cat-proc.sh b/tests/misc/cat-proc.sh
new file mode 100755
index 0000000..44dbe9a
--- /dev/null
+++ b/tests/misc/cat-proc.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+# Ensure that cat -E produces same output as cat, modulo '$'s,
+# even when applied to a file in /proc.
+
+# Copyright (C) 2006-2022 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ cat
+
+
+f=/proc/cpuinfo
+test -f $f \
+  || skip_ "no $f"
+
+
+# Yes, parts of /proc/cpuinfo might change between cat runs.
+# If that happens, consider choosing a file that's less likely to change,
+# or just filter out the changing lines.  The sed filter should help
+# to avoid any spurious numeric differences.
+cat -E $f | sed 's/[0-9][0-9]*/D/g' | tr -d '$' > out || fail=1
+cat    $f | sed 's/[0-9][0-9]*/D/g' | tr -d '$' > exp || fail=1
+
+compare exp out || fail=1
+
+Exit $fail