bash 您如何判断当前终端会话是否在 GNU 屏幕中？
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How do you tell if the current terminal session is in GNU screen?
提问by OTZ
I have a command I want to execute in .bashrconly when the current terminal
window is managed by GNU screen. How do I do this? Is there an environment variable for it? I used to have
我有一个命令，我只想.bashrc在当前终端窗口由 GNU screen 管理时执行。我该怎么做呢？有它的环境变量吗？我曾经有过
if [ -n "$WINDOW" ]; then
command
fi
But from what I can tell, $WINDOWmay or may not be defined across all screen
managed sessions.
但据我所知，$WINDOW可能会或可能不会在所有屏幕管理会话中定义。
回答by signine
Check for the environment variable $STY (contains info about the screen) or for $TERM being 'screen' (probably less reliable).
检查环境变量 $STY（包含有关屏幕的信息）或 $TERM 是否为“屏幕”（可能不太可靠）。
回答by rhlee
signine is correct
签名是正确的
See the doc
查看文档
http://www.gnu.org/software/screen/manual/html_node/Environment.html
http://www.gnu.org/software/screen/manual/html_node/Environment.html
STYAlternate socket name. If
screenis invoked, and the environment variableSTYis set, then it creates only a window in the runningscreensession rather than starting a new session.
STY备用套接字名称。如果
screen调用并STY设置了环境变量，那么它只会在正在运行的screen会话中创建一个窗口，而不是启动一个新会话。
回答by mykhal
check $TERM, it is set to 'screen' in screen session.. (but not 100% guaranteed)
检查$TERM，它screen在屏幕会话中设置为“ ”..（但不是 100% 保证）
UPDATE
更新
alternatively, you can utilize the fact that in screen, $TERMCAPcontains screen substring:
或者，您可以利用在屏幕中$TERMCAP包含屏幕子字符串的事实：
[[ $TERMCAP =~ screen ]] && echo "in screen"
also not 100% guaranteed
也不是 100% 保证
UPDATE2
更新2
if neither approach works, you can find some inspiration in screen manual
如果两种方法都不起作用，您可以在屏幕手册中找到一些灵感
回答by hrvoj3e
I would like to suggest an alternative solution that is always visible and does not require checking to know you are inside a screensession.
我想建议一个始终可见的替代解决方案，不需要检查就知道您在screen会话中。
Just add/edit a file ~/.screenrcin your $HOMEfolder and add captioncommand:
只需~/.screenrc在您的$HOME文件夹中添加/编辑一个文件并添加caption命令：
caption always "%{= kc}Screen session on %H (system load: %l)%-28=%{= .m} %Y-%m-%d %0c"
and you will get at the very bottom one line that is always visible and colored.
你会在最底部看到一条始终可见且有颜色的线。
Screen session on host (system load: 1.50 1.40 1.30) 2017-04-23 14:06
Please note:
请注意：
When you are inside screen on host1 and open another SSH session to host2 and open screen there which also has
.screenrcyou will get two lines at the bottom stacked from bottom up (like a wrapper).This is VERY useful in that case!
Screen session on host2 (system load: 0.01 0.03 0.05) 2017-04-23 14:14Screen session on host1 (system load: 0.00 0.00 0.00) 2017-04-23 14:14
当您在 host1 上的 screen 内部并打开另一个到 host2 的 SSH 会话并在那里打开 screen 时，
.screenrc您将在底部看到两行自下而上堆叠的行（如包装器）。这在那种情况下非常有用！
Screen session on host2 (system load: 0.01 0.03 0.05) 2017-04-23 14:14Screen session on host1 (system load: 0.00 0.00 0.00) 2017-04-23 14:14
Additional info:
附加信息：
https://www.gnu.org/software/screen/manual/html_node/Caption.html
Command: caption always|splitonly [string]https://www.gnu.org/software/screen/manual/html_node/String-Escapes.html#String-Escapes
https://www.gnu.org/software/screen/manual/html_node/Caption.html
Command: caption always|splitonly [string]https://www.gnu.org/software/screen/manual/html_node/String-Escapes.html#String-Escapes
I found this hit hereon SO.
我发现这个打这里的SO。
回答by iniju
Check variable $TERM
检查变量 $TERM
