$user 或 $whoami 不在 bash shell 脚本中工作

$user or $whoami not working in a bash shell script

提问by Mistu4u

I am learning basic unix shell scripting now. I was trying a code from hereto write my username but it is not working.

我现在正在学习基本的 unix shell 脚本。我正在尝试使用此处的代码来编写我的用户名，但它不起作用。

The code is:

代码是：

#
# Script to print user information who is currently logged in , current date & time
#
clear
echo "Hello $USER"
echo "Today is \c ";date
echo "Number of user login : \c" ; who | wc -l
echo "Calendar"
cal
exit 0

I tried $whoamiinstead of $user, but still it is not showing my username. What can be the issue here? I am using vim editor in Ubuntu.

我尝试了$whoami而不是$user，但它仍然没有显示我的用户名。这里有什么问题？我在 Ubuntu 中使用 vim 编辑器。

回答by Shiplu Mokaddim

1. If $USERis not working try, $LOGNAME. If you have already learned about command substitution then you can use $(whoami)or $(id -n -u). ^Ref

2. \cin echowont work unless you specify with -e(stands for enable interpretation of backslash escapes).

   echo -e "Today is \c ";date
   

   It seems you want to prevent the trailing new line character introduced by echo. Another way to achieve this is to just add -n. Then you don't need -eand \c.

   echo -n "Today is "; date
   

1. 如果$USER不起作用，请尝试$LOGNAME。如果您已经了解了命令替换，那么您可以使用$(whoami)或$(id -n -u)。^参考

2. \cinecho除非您指定 with -e(代表启用反斜杠转义的解释)，否则将无法工作。

   echo -e "Today is \c ";date
   

   似乎您想防止由echo. 实现此目的的另一种方法是添加-n. 那你就不需要-eand 了\c。

   echo -n "Today is "; date
   

回答by konsolebox

I tried `$whoami`

我试过 `$whoami`

What you probably mean to do is `whoami`or $(whoami).

您可能想要做的是`whoami`或$(whoami)。

See Command Substitution.

请参阅命令替换。