Home >Operation and Maintenance >Linux Operation and Maintenance >'Advanced Bash-scripting Guide' Learning (17): Use more to view gzip files
本文所选的例子来自于《Advanced Bash-scripting Gudie》一书,译者 杨春敏 黄毅
<span style="color: #008080"> 1</span> #!/bin/<span style="color: #000000">bash </span><span style="color: #008080"> 2</span> <span style="color: #000000">#使用more查看gzip文件 </span><span style="color: #008080"> 3</span> <span style="color: #008080"> 4</span> NOARGS=<span style="color: #800080">65</span> <span style="color: #008080"> 5</span> NOTFOUND=<span style="color: #800080">66</span> <span style="color: #008080"> 6</span> NOTGZIP=<span style="color: #800080">67</span> <span style="color: #008080"> 7</span> <span style="color: #008080"> 8</span> <span style="color: #0000ff">if</span> [ $# -eq <span style="color: #800080">0</span><span style="color: #000000"> ] #[ $# -eq 0 ]与[ -z "$1" ]有同样的效果 </span><span style="color: #008080"> 9</span> <span style="color: #0000ff">then</span> <span style="color: #008080">10</span> <span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">Usage: `basename $0` filename</span><span style="color: #800000">"</span> >&2 #将错误输出到屏幕,&[n]表示已存在的文件描述符,&2表示标准错误输出,如换成&>2,屏幕不显示错误输出,why? <span style="color: #008080">11</span> <span style="color: #000000"> exit $NOARGS </span><span style="color: #008080">12</span> <span style="color: #0000ff">fi</span> <span style="color: #008080">13</span> <span style="color: #008080">14</span> filename=$<span style="color: #800080">1</span> <span style="color: #008080">15</span> <span style="color: #008080">16</span> <span style="color: #0000ff">if</span> [ ! -f <span style="color: #800000">"</span><span style="color: #800000">$filename</span><span style="color: #800000">"</span><span style="color: #000000"> ] </span><span style="color: #008080">17</span> <span style="color: #0000ff">then</span> <span style="color: #008080">18</span> <span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">File $filename not found!</span><span style="color: #800000">"</span> >&2 #和上面一样,只是感觉没必要再stderr重定向到标准屏幕,因为默认就是标准错误输出到屏幕的,所以可以去掉 <span style="color: #008080">19</span> <span style="color: #000000"> exit $NOTFOUND </span><span style="color: #008080">20</span> <span style="color: #0000ff">fi</span> <span style="color: #008080">21</span> <span style="color: #008080">22</span> <span style="color: #0000ff">if</span> [ ${filename##*.} != <span style="color: #800000">"</span><span style="color: #800000">gz</span><span style="color: #800000">"</span><span style="color: #000000"> ] #<span style="background-color: #00ff00">变量替换,拿走.之前的所有的字符串,参照《ABS》中文版第23页echo ${PATH#*:}拿掉第一个:左边所有字串 </span></span><span style="color: #008080">23</span> <span style="color: #0000ff">then <span style="color: #000000">#<span style="background-color: #00ff00">##是判断最后面的. #只是判断第一个 ##最远匹配 #最近匹配</span></span></span> <span style="color: #008080">24</span> <span style="color: #0000ff">echo</span> <span style="color: #800000">"</span><span style="color: #800000">File $1 is not a gzipped file!</span><span style="color: #800000">"</span> <span style="color: #008080">25</span> <span style="color: #000000"> exit $NOTGZIP </span><span style="color: #008080">26</span> <span style="color: #0000ff">fi</span> <span style="color: #008080">27</span> <span style="color: #008080">28</span> <span style="color: #0000ff">zcat</span> $<span style="color: #800080">1</span> | <span style="color: #0000ff">more <span style="color: #000000">#<span style="background-color: #00ff00">zcat命令用于不真正解压缩文件,就能显示压缩包中文件的内容的场合</span></span></span> <span style="color: #008080">29</span> <span style="color: #008080">30</span> exit $?
脚本运行结果
The above is the detailed content of 'Advanced Bash-scripting Guide' Learning (17): Use more to view gzip files. For more information, please follow other related articles on the PHP Chinese website!