1 files changed, 23 insertions, 1 deletions
diff --git a/bin/igex b/bin/igex
index 1ca23ecf..c514006d 100755
--- a/bin/igex
+++ b/bin/igex
@@ -1,12 +1,34 @@
 #!/bin/sh
-# Run a command and ignore specified exit values.
+# 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"