bash 我试图在 Linux 中获取 MAC 地址作为变量,但它很少起作用

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时间:2020-09-18 06:04:11  来源:igfitidea点击:

I'm trying to get the MAC address as a variable in Linux, but it rarely works

bashangstrom-linux

提问by McB

I'm using the following code to get the MAC address of eth0 into a variable for use in a filename, but it rarely every works. It isn't that it NEVER works, it is just unpredictable.

我正在使用以下代码将 eth0 的 MAC 地址放入一个变量中以用于文件名,但它很少能正常工作。并不是它永远不会起作用,它只是不可预测的。

ntpdate -b 0.centos.pool.ntp.org
DATE=$(date +%s)
MAC=$(ifconfig eth0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}' | sed 's/://g')
cp logfile logfilecp-$MAC-$DATE

Now, it seems to work less-frequently if I use the ntpdate line, but regardless, it is wholly unpredictable. Anyone have any idea what I could do to make this work better? I end up with a filename like

现在,如果我使用 ntpdate 行,它似乎不那么频繁地工作,但无论如何,它是完全不可预测的。任何人都知道我可以做些什么来使这项工作更好?我最终得到一个文件名

logfile--1375195808.bz2

New info

新信息

I've got the script setup to run as a cronjob (crontab -e). I notice that when it runs as a cronjob, it doesn't get the MAC, but when I run it manually ./runscript.bash it does get the MAC. Hopefully someone knows why this might be causing it.

我已经将脚本设置作为 cronjob (crontab -e) 运行。我注意到当它作为 cronjob 运行时,它没有获得 MAC,但是当我手动运行它时 ./runscript.bash 它确实获得了 MAC。希望有人知道为什么这可能会导致它。

Thanks.

谢谢。

回答by jderefinko

Try an easier method to get you mac address than through ifconfig, i.e.

尝试一种比通过 ifconfig 更简单的方法来获取 mac 地址,即

cat /sys/class/net/eth0/address

I've tested it in shell (not through script) and works like a charm :

我已经在 shell 中测试过它(不是通过脚本),并且效果很好:

TEST=`cat /sys/class/net/eth0/address`
touch /tmp/blabla-$TEST

EDIT for your second problem

编辑你的第二个问题

in you cron script, add the full path of the binaries you're using (i.e. /sbin/ifconfig), or use my method as above :)

在你的 cron 脚本中,添加你正在使用的二进制文件的完整路径(即 /sbin/ifconfig),或者使用我上面的方法:)

回答by CloudWalker

 ip addr | grep link/ether | awk '{print }'