June 2012
Beginner
227 pages
5h 43m
English
Content preview from Macintosh Terminal Pocket GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Whitespace and Linebreaks
bash shell scripts are sensitive to whitespace
and linebreaks. Because the “keywords” of this programming language are
actually commands evaluated by the shell, you need to separate arguments
with whitespace. Likewise, a linebreak in the middle of a command will
mislead the shell into thinking the command is incomplete. Follow the
conventions we present here and you should be fine.
If you must break a long command into multiple lines, end each
line (except the last) with a single \ character, which means “continued on next
line”:
➜ grep abcdefghijklmnopqrstuvwxyz file1 file2 \
file3 file4The slash must be the final character on its line: that is, you
must press Enter immediately after it. Finally, any text following a
hash mark (#) on a line is a comment.
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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.