解决ubuntu crontab不执行的方法
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>在脚本文件的第二行添加下面一句即可</p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin </div>
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下面是分析解决问题的步骤：</p>
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1.不执行的原因是环境变量引起的</p>
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2.目前没有找到配置cron的默认环境变量配置方法</p>
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vim /etc/crontab 可以看到这个文件里的环境变量是正确的</p>
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3. * * * * * /root/test.sh >ifconfig.txt 2>&1 & 每分钟执行一次test.sh</p>
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test.sh的内容如下，可以看到输出结果环境变量是 /usr/bin:/bin<br>
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<span><u>复制代码</u></span>
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代码如下:</p>
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#!/bin/bash<br>
#PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin<br>
ifconfig<br>
echo $PATH</div>
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<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>输出：</span></p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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/root/test.sh: line 3: ifconfig: command not found<br>
/usr/bin:/bin</div>
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4.查看ifconfig的位置<br>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<a href="mailto:root@ubuntu">root@ubuntu</a>:~# whereis ifconfig<br>
ifconfig: /sbin/ifconfig /usr/share/man/man8/ifconfig.8.gz</div>
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5.把test.sh脚本的第二行注释掉可以看到输出结果如下<br>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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eth0 Link encap:Ethernet HWaddr aa:00:04:00:0a:04 <br>
inet addr:192.168.1.60 Bcast:0.0.0.0 Mask:255.255.255.0<br>
inet6 addr: fe80::20c:29ff:fef8:73b6/64 Scope:Link<br>
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1<br>
RX packets:2093659 errors:0 dropped:0 overruns:0 frame:0<br>
TX packets:1532815 errors:0 dropped:0 overruns:0 carrier:0<br>
collisions:0 txqueuelen:1000 <br>
RX bytes:519122457 (519.1 MB) TX bytes:447226592 (447.2 MB)<br>
lo Link encap:Local Loopback <br>
inet addr:127.0.0.1 Mask:255.0.0.0<br>
inet6 addr: ::1/128 Scope:Host<br>
UP LOOPBACK RUNNING MTU:16436 Metric:1<br>
RX packets:433596 errors:0 dropped:0 overruns:0 frame:0<br>
TX packets:433596 errors:0 dropped:0 overruns:0 carrier:0<br>
collisions:0 txqueuelen:0 <br>
RX bytes:23228192 (23.2 MB) TX bytes:23228192 (23.2 MB)</p> <p> /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin</div>
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<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> </span></p>
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6.test.sh脚本只是临时改变了PATH的值，它只在当前脚本生效</p>
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