8.3 重定向输出 ..................................................................... 95
8.4 重定向输入 ..................................................................... 95
8.5 重定向标准输出和标准错误 ....................................................... 95
8.6 重定向到空设备 ................................................................. 96
8.7 read 命令 ...................................................................... 97
第九章 Shell 信号发送与捕捉 ...................................................... 98
9.1 Linux 信号类型 ................................................................. 98
9.2 kill 命令 ..................................................................... 100
9.3 trap 命令 ..................................................................... 100
第十章 Shell 编程时常用的系统文件 ............................................... 102
10.1 Linux 系统目录结构 ........................................................... 102
10.2 环境变量文件 ................................................................. 103
10.3 系统配置文件 ................................................................. 103
10.4 /dev 目录 .................................................................... 104
10.5 /proc 目录 ................................................................... 104
10.5.1 /proc .................................................................... 105
10.5.2 /proc/net ................................................................ 105
10.5.3 /proc/sys ................................................................ 106
第十一章 Shell 常用命令与工具 ................................................... 108
11.1 ls ........................................................................... 108
11.2 echo ......................................................................... 109
11.3 printf ....................................................................... 109
11.4 cat .......................................................................... 110
11.5 tac .......................................................................... 111
11.6 rev .......................................................................... 111
11.7 wc ........................................................................... 111
11.8 cp ........................................................................... 111
11.9 mkdir ........................................................................ 112
11.10 mv .......................................................................... 112
11.11 rename ...................................................................... 112
11.12 dirname ..................................................................... 113
11.13 basename .................................................................... 113
11.14 du .......................................................................... 113
11.15 cut ......................................................................... 114
11.16 tr .......................................................................... 114
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