Sams Teach Yourself Shell Programming in 24 Hours, Second Edition

Hour 22

1:	Add a check to the sshd init script that verifies if the user is root. (Init scripts should only be executed by root). HINT: Use the id and sed commands.
A1:	You can add a check similar to the following to the beginning of the init script: CURUID="`id | sed -e 's/(.*$//' -e 's/^.*\=//'`" if [ "$CURUID" -ne 0 ] ; then echo "Error: Only root (uid=0) can run this script." 1>&2 exit 1 fi unset CURUID
2:	The showperson script lists all matching entries in the address book based on a name provided by the user. The matches produced are case sensitive. How can you change the script matches so they aren't case sensitive?
A2:	Use grep -i instead of grep.
3:	Both the showperson and delperson scripts reproduce the following code PATH=/bin:/usr/bin ...