shell-scripts-main.zip （31个子文件） 
shell-scripts-main 
.gitignore 38B LICENSE 1KB README.md 289B chapter12 check-user.sh 287B condition-check.sh 262B test-numeric-comparison.sh 314B if-statement.sh 181B if-then-else.sh 321B test-command.sh 937B elif-else-statement.sh 633B elif-statement.sh 339B multi-commands.sh 314B chapter11 log.210302 8KB calculate.sh 308B bc.sh 518B echo-shell.sh 301B log2.210302 36B calculate-complex.sh 278B cmd-substitution.sh 246B date-log.sh 195B exit-code-demo.sh 224B calculate-simple.sh 431B env-variables.sh 266B append-log.sh 124B pipeline.sh 102B exit-code.sh 490B README.md 168B output.log 108B
hello_world.txt 105B log1.210302 12B user-variables.sh 620B资源评论
