From c8ab406749124d2e762ad5cf53963070113afd0f Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Wed, 5 Apr 2017 20:06:39 +1200
Subject: Apply runtime shebanging to POSIX shell

---
 bin/d2u.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 bin/d2u.sh

(limited to 'bin/d2u.sh')

diff --git a/bin/d2u.sh b/bin/d2u.sh
new file mode 100644
index 00000000..22c8e16b
--- /dev/null
+++ b/bin/d2u.sh
@@ -0,0 +1,25 @@
+# Convert DOS line endings to UNIX ones
+
+# Check arguments
+if [ "$#" -eq 0 ] ; then
+    printf >&2 'd2u: Need a filename\n'
+    exit 2
+fi
+
+# Put a carriage return into a variable for convenience
+r=$(printf '\r')
+
+# Iterate over arguments and apply the same ed(1) script to each of them
+for fn ; do
+
+    # Note the heredoc WORD is intentionally unquoted because we want to expand
+    # $r within it to get a literal carriage return; the escape characters
+    # prescribed for ed(1) by POSIX are very limited
+    ed -s -- "$fn" <<EOF || ex=1
+g/$r\$/ s/$r\$//
+w
+EOF
+done
+
+# If any of the ed(1) commands failed, we should exit with 1
+exit "${ex:-0}"
-- 
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