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Let’s take the linux shadow file as an example. Using sed you can replace the root user password with an empty character. Suppose your /etc/shadow file look like this: [root@localhost ~]# cat /etc/shadow root:$6$GE3JYGgDvt5jloXN$l0cNhqsh8564GHsdSgUGz79Cqm2ml.Q0xmtgSDyUVdJRHrgFIWPd0QKB02RedspqunU4yYS0/xDI0fcZgEGt.::0:99999:7::: You can use the following sed command to replace the root password string between the two semicolon with an empty string.

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