《Linux Shell Scripting Cookbook》
章节内容：
ch1: echo, bc, alias, redirection, array, stty, date, debug, function, read, iterator, test
ch2: cat, find, xargs, tr, checksum, sort, uniq, mktemp, prefix/suffix, concurrency
ch3: dd, comm, chmod, chattr, touch, ln, diff, patch, tail, head, wc, tree
ch4: grep, cut, sed, awk, paste
ch5: wget, curl
ch6: tar, gzip, bzip2, zip
ch7: host, nslookup, ping, lsof
ch8: du, df, iotop, watch
ch9: ps, crontab项目结构：
.
├── README.md
├── ch1
│ ├── debug.sh
│ ├── examples.sh
│ ├── ifs.sh
│ ├── repeat.sh
│ ├── sleep.sh
│ └── time_take.sh
├── ...
├── ch9
└── clean.sh