视频选集
（13/31）
001 Welcome
01:02
002 What you should know
00:17
003 Using the exercise files
00:18
004 Exploring the Bash documentation
01:57
005 Setting the script interpreter and permissions
06:30
006 Time commands and set variables
09:11
007 Bash startup
04:28
008 Sourcing and aliasing with bash
05:34
009 Displaying text with the echo command
04:10
010 Challenges - Scripts with exported variables, sourcing, and echo
02:07
011 Solutions - Scripts with exported variables, sourcing, and echo
04:21
012 The typeset and declare commands for variables
05:08
013 Looping with for-while sequences and reading input
14:21
014 Defining functions and using return and exit
06:29
015 Using file descriptors, file redirection, pipes, and here documents
16:53
016 Control-flow case statements and if-then-else with the test command
10:11
017 Using arithmetic operators
02:28
018 Challenges - Using local variables in functions, loops, and arithmetic
02:44
019 Solutions - Using local variables in functions, loops, and arithmetic
04:03
020 Defining filters and using head, tail, and wc
05:04
021 Using sed and AWK for more powerful scripting
13:23
022 Positional parameters and operators with braces
10:08
023 Challenges - Looping, special variable operators, sed, and AWK
01:55
024 Solutions - Looping, special variable operators, sed, and AWK
02:26
025 Using the coproc command
05:53
026 Debugging scripts with -x and -u options
04:01
027 Signals and traps
04:14
028 Using the eval and getopt commands
06:48
029 Challenges - Debugging scripts using trap, eval, getopt, and coproc
02:50
030 Solutions - Debugging scripts using trap, eval, getopt, and coproc
07:23
031 Next steps
00:27
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