Package: gzip Version: 1.2.4-6 -chiark:~> really zgrep spong /dev/null ..: Exec format error -chiark:~> perl -e 'exec("/usr/bin/zgrep","spong","/dev/null"); die $'\!';' Exec format error at -e line 1. -chiark:~> file /usr/bin/zgrep /usr/bin/zgrep: ASCII text -chiark:~> head -3 /usr/bin/zgrep : #!/bin/sh -chiark:~>