March 2002
Beginner
504 pages
10h 47m
English
Content preview from Sams Teach Yourself Shell Programming in 24 Hours, Second Edition
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Hour 9
| 1: | What combination of wildcards should you use to list all the files in the current directory that end in the form hwXYZ.ABC? Here X and Y can be any number; Z is a number between 2 and 6; and A, B, and C are characters. |
| A1: | The following command will accomplish this task:
$ ls *hw[0-9][0-9][2-6].??? |
| 2: | What action is performed by the following line, if the variable MYPATH is unset:
: ${MYPATH:=/usr/bin:/usr/sbin:/usr/ucb}
|
| A2: | If MYPATH is unset, it is set to the given value, which is then substituted. |
| 3: | What is the difference between the actions performed by the command given in the previous problem and the action performed by the following command:
: ${MYPATH:-/usr/bin:/usr/sbin:/usr/ucb}
|
| A3: | If MYPATH is unset, the given value is substituted ... |
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.