Slightly modify 1998/dlowe/try scripts

Allow specifying paths to man, col and cat. This is done in a way that
the CC variable should have been done in all the other scripts
(and this one) but I didn't think about it at the time.

1998/dlowe/README.md

@@ -11,7 +11,9 @@ below for more details.
 ## To use:
 
 ```sh
-./dlowe < anyfile > pootfile
+./dlowe < file > pootfile
+
+./dlowe < file
 ```
 
 
@@ -42,6 +44,8 @@ Also try:
 ./try.sh
 ```
 
+Did you spot the Easter egg there?
+
 
 ## Alternate code:
 
@@ -59,7 +63,7 @@ make alt
 ### Alternate use:
 
 ```
-./dlowe.alt < anyfile > pootfile
+./dlowe.alt < file > pootfile
 ```
 
 What's the difference between this and `dlowe`?
@@ -71,6 +75,9 @@ What's the difference between this and `dlowe`?
 ./try.alt.sh
 ```
 
+Did you spot the Easter egg there?
+
+
 
 ## Judges' remarks:
 

1998/dlowe/try.alt.sh

@@ -5,18 +5,18 @@
 
 make everything || exit 1
 
-CAT="$(type -P cat)"
-MAN="$(type -P man)"
-COL="$(type -P col)"
+[[ -z "$CAT" ]] && CAT="$(type -P cat)"
+[[ -z "$MAN" ]] && MAN="$(type -P man)"
+[[ -z "$COL" ]] && COL="$(type -P col)"
 
 if [[ -z "$CAT" || ! -e "$CAT" ]]; then
-    echo "$0: no cat found" 1>&2
+    echo "$0: no cat '$CAT' found" 1>&2
     exit 1
 elif [[ -z "$COL" || ! -e "$COL" ]]; then
-    echo "$0: col not found" 1>&2
+    echo "$0: col '$COL' not found" 1>&2
     exit 1
 elif [[ -z "$MAN" || ! -e "$MAN" ]]; then
-    echo "$0: can't execute man" 1>&2
+    echo "$0: can't execute '$MAN'" 1>&2
     exit 1
 fi
 

1998/dlowe/try.sh

@@ -5,18 +5,18 @@
 
 make all || exit 1
 
-CAT="$(type -P cat)"
-MAN="$(type -P man)"
-COL="$(type -P col)"
+[[ -z "$CAT" ]] && CAT="$(type -P cat)"
+[[ -z "$MAN" ]] && MAN="$(type -P man)"
+[[ -z "$COL" ]] && COL="$(type -P col)"
 
 if [[ -z "$CAT" || ! -e "$CAT" ]]; then
-    echo "$0: no cat found" 1>&2
+    echo "$0: no cat '$CAT' found" 1>&2
     exit 1
 elif [[ -z "$COL" || ! -e "$COL" ]]; then
-    echo "$0: col not found" 1>&2
+    echo "$0: col '$COL' not found" 1>&2
     exit 1
 elif [[ -z "$MAN" || ! -e "$MAN" ]]; then
-    echo "$0: can't execute man" 1>&2
+    echo "$0: can't execute '$MAN'" 1>&2
     exit 1
 fi