Читать книгу Linux Bible - Christopher Negus - Страница 218

This idea has been handed down from generation to generation of old UNIX hacks. It's really quite simple, but it employs several of the concepts just introduced.

 #!/bin/bash # (@)/ph # A very simple telephone list # Type "ph new name number" to add to the list, or # just type "ph name" to get a phone number PHONELIST=~/.phonelist.txt # If no command line parameters ($#), there # is a problem, so ask what they're talking about. if [ $# -lt 1 ] ; then echo "Whose phone number did you want? " exit 1 fi # Did you want to add a new phone number? if [ $1 = "new" ] ; then shift echo $*>> $PHONELIST echo $* added to database exit 0 fi # Nope. But does the file have anything in it yet? # This might be our first time using it, after all. if [ ! -s $PHONELIST ] ; then echo "No names in the phone list yet! " exit 1 else grep -i -q "$*" $PHONELIST # Quietly search the file if [ $? -ne 0 ] ; then # Did we find anything? echo "Sorry, that name was not found in the phone list" exit 1 else grep -i "$*" $PHONELIST fi fi exit 0

So, if you created the telephone list file as ph in your current directory, you could type the following from the shell to try out your ph script:

 $ chmod 755 ph $ ./ph new "Mary Jones" 608-555-1212 Mary Jones 608-555-1212 added to database $ ./ph Mary Mary Jones 608-555-1212

The chmod command makes the ph script executable. The ./ph command runs the ph command from the current directory with the new option. This adds Mary Jones as the name and 608-555-1212 as the phone number to the database ($HOME/.phonelist.txt). The next ph command searches the database for the name Mary and displays the phone entry for Mary. If the script works, add it to a directory in your path (such as $HOME/bin).