profile和bash

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I am reading about basic shell scripting from Linux Command Line and Shell Scripting Bible. It says that the /etc/profile file sets the environment variables at startup of the Bash shell. The /etc/profile.d directory contains other scripts that contain application-specific startup files, which are also executed at startup time by the shell.

bash窗口里看JAVA_HOME设置好了，但是./xxx总说没设置，原来是这个原因，运维tmd设置了java_home但是只导出了path，一直以为bash窗口里echo能看到就是没问题，最后发现是这么回事儿。