Your friend, the echo command
In man
y of our examples, we’ll print information to the screen
with the echo command, which we’ll formally describe in
“Screen Output” on page 203. echo is one of the simplest com‐
mands—it merely prints its arguments on standard output,
once those arguments have been processed by the shell:
→ echo My dog has fleas
My dog has fleas
→ echo My name is $USER Shell variable USER
My name is smith
Long command lines
Sometimes, a command will be too lengthy to fit on one line in
the book. In these cases, we’ll split the command onto multiple
lines that end with a backward slash character:
→ echo This is a long command that doesn't fit on \
one line
This is a long command that doesn't fit on one line
This is not merely a helpful notation: the backslash character
actually serves this purpose in the Linux shell, as a “line contin‐
uation” character. Of course, if your terminal is wider than this
page, you can omit the backslash and just type the whole com‐
mand on one line.
Practicing with This Book
This book comes with a collection of files for practicing with
Linux. If you download these files and install them on any
Linux machine, then you can run most of the example com‐
10 | Linux Pocket Guide
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