Apply runtime shebanging to POSIX shell

1 files changed, 33 insertions, 0 deletions

diff --git a/bin/igex.sh b/bin/igex.sh
new file mode 100644
index 00000000..09f1206f
--- /dev/null
+++ b/bin/igex.sh
@@ -0,0 +1,33 @@
+# Run a command and ignore specified exit values
+
+# There should be at least two arguments
+if [ "$#" -eq 0 ] ; then
+    printf >&2 'igs: Need an ignore list x,y,z and a command\n';
+fi
+
+# The list of values to ignore is the first argument; add a trailing comma for
+# ease of parsing; shift it off
+igs=$1,
+shift
+
+# Run the command in the remaining arguments and grab its exit value
+"$@"
+ex=$?
+
+# Iterate through the ignored exit values by chopping its variable and checking
+# each value until it's empty
+while [ -n "$igs" ] ; do
+
+    # Get the first exit value in the remaining list
+    ig=${igs%%,*}
+
+    # If it matches the command's exit value, exit with 0
+    [ "$((ig == ex))" -eq 1 ] && exit 0
+
+    # Chop it off the list for the next iteration
+    igs=${igs#*,}
+done
+
+# If we got right through the list, we exit with the same value as the command;
+# i.e. we are not ignoring the value
+exit "$ex"