diff --git a/sample_scripts/lprbw b/sample_scripts/lprbw
index 17d281a..2311dd2 100755
--- a/sample_scripts/lprbw
+++ b/sample_scripts/lprbw
@@ -1,3 +1,4 @@
+#!/bin/sh
 cat $1 | \
 gs -sDEVICE=pbmraw -q -sPAPERSIZE=a4 -dNOPAUSE -r600 -sOutputFile=- - | \
 pnm2ppa --bw --eco $2 $3 $4 $5 -i - -o  /dev/lp0
diff --git a/sample_scripts/lprcolor b/sample_scripts/lprcolor
index b745b5b..9ee223f 100755
--- a/sample_scripts/lprcolor
+++ b/sample_scripts/lprcolor
@@ -1,3 +1,4 @@
+#!/bin/sh
 cat $1 | \
 gs -sDEVICE=ppmraw -q -sPAPERSIZE=a4 -dNOPAUSE -r600 -sOutputFile=- - | \
 pnm2ppa   $2 $3 $4 $5 -i - -o /dev/lp0  
diff --git a/sample_scripts/lpreco b/sample_scripts/lpreco
index 450cbe3..7e0674e 100755
--- a/sample_scripts/lpreco
+++ b/sample_scripts/lpreco
@@ -1,3 +1,4 @@
+#!/bin/sh
 cat $1 | \
 gs -sDEVICE=ppmraw -q -sPAPERSIZE=a4 -dNOPAUSE -r600 -sOutputFile=- - | \
 pnm2ppa --eco  $2 $3 $4 $5 -i - -o  /dev/lp0