or download this
$ strace -f -eexecve perl -e 'system("import -window root MyScreenshot
+.png")'
execve("/usr/local/bin/perl", ["perl", "-e", "system(\"import -window
+root MySc"...], [/* 31 vars */]) = 0
...
[pid 20945] execve("/usr/local/bin/import", ["import", "-window", "roo
+t", "MyScreenshot.png"], [/* 31 vars */]) = -1 ENOENT (No such file o
+r directory)
[pid 20945] execve("/usr/sbin/import", ["import", "-window", "root", "
+MyScreenshot.png"], [/* 31 vars */]) = -1 ENOENT (No such file or dir
+ectory)
[pid 20945] execve("/usr/bin/import", ["import", "-window", "root", "M
+yScreenshot.png"], [/* 31 vars */]) = 0