Introduction to shells
Overview
Why do we need a shell?
Shell
syntax
Types of shell
command
Simple
commands
Pipelines
Grouping
commands
Exit status
List commands
Arithmetic
Operators and
functions
Making
decisions
The 'test'
statement
Operators used by 'test'
The 'if'
statement
Loops
'For' loops
'While' and
'until' loops
Searching for files
Arguments to
'find'
Formatted output
Arguments to
'printf'
Passing information to
scripts
Scripts with
arguments
Parameter
expansion
Summary
Exercises
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Summary
The following commands were introduced in this chapter
bc |
calculator |
break |
exit from for, while or
until loop |
continue |
continue for, while or
until loop |
false |
returns 'false' value, exit status 1 |
find |
find files |
printf |
write formatted output |
shift |
shift positional parameters |
test |
evaluate expression |
true |
returns 'true' value, exit status 0 |
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