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Check Whether a User Exists
...
Why don't you simply use
grep -c '^username:' /etc/passwd
It will return 1 (since a user has max. 1 entry) if the user exists and 0 if it doesn't.
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CentOS搭建sock5代理服务器(XEN VPS ) - 更多技术 - 清泛网 - 专注C/C++及内核技术
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#
auth 0.0.0.0/0 - u
在 /etc/opt/ss5/ss5.passwd 中添加 用户名和密码 如：
test test
使用用户验证，重启ss5服务
/etc/init.d/ss5 restart
服务器 sock5 代理 搭建
Can you run GUI applications in a Docker container?
... xvfb firefox
RUN mkdir ~/.vnc
# Setup a password
RUN x11vnc -storepasswd 1234 ~/.vnc/passwd
# Autostart firefox (might not be the best way to do it, but it does the trick)
RUN bash -c 'echo "firefox" >> /.bashrc'
This will create a Docker container running VNC with the password ...
mac os下如何获得root权限？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...root权限？操作步骤：1.打开实用工具 －> 终端2.键入sudo passwd root 然后提示你输入当前登录用户密码，通过以后，提示你输入两遍root的密码。...操作步骤：
1.打开实用工具 －> 终端
2.键入sudo passwd root 然后提示你输入当前登录用...
Http Basic Authentication in Java using HttpClient?
... HttpGet httpGet = new HttpGet("https://httpbin.org/basic-auth/user/passwd");
String encoding = DatatypeConverter.printBase64Binary("user:passwd".getBytes("UTF-8"));
httpGet.setHeader("Authorization", "Basic " + encoding);
HttpResponse response = Client.execute(httpGe...
Read entire file in Scala?
... the party, but I'd hate for people not to know they can do "io.File("/etc/passwd").slurp" in trunk.
– psp
Aug 26 '09 at 3:48
28
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廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ster用户的的UID和GID相同在两台节点上分别执行：
cat /etc/passwd | grep hacluster
结果相同即可
5.2配置heartbeat
在从节点上也作同样的操作
配置主节点的heartbeatHeartbeat的主要配置文件有ha.cf、haresources、authkeys，均在/etc/ha.d目录 ...
Meaning of tilde in Linux bash (not home directory)
... is usually controlled by NSS; so by default values are pulled out of /etc/passwd, though it can be configured to retrieve the information using any source desired, such as NIS, LDAP or an SQL database.
Tilde expansion is more than home directory lookup. Here's a summary:
~ $HOME
~fred ...
Confused about stdin, stdout and stderr?
... these files can be easily redirected from the shell, like this:
cat /etc/passwd > /tmp/out # redirect cat's standard out to /tmp/foo
cat /nonexistant 2> /tmp/err # redirect cat's standard error to /tmp/error
cat < /etc/passwd # redirect cat's standard input to /etc/pass...
How can I suppress all output from a command using Bash?
...o assign the result of a command to a variable:
$ DUMMY=$( grep root /etc/passwd 2>&1 )
$ echo $?
0
$ DUMMY=$( grep r00t /etc/passwd 2>&1 )
$ echo $?
1
Since Bash and other POSIX commandline interpreters does not consider variable assignments as a command, the present command's retu...