RedHatLinux permission management

RedHatLinux permission management ls to check the file permissions, it should be that there is no execution permission (x), you can add: chmoda + xfilename: Display the environment variable echo $ variable name set the environment variable csh in Linux/unix: add the setenvJAV Red Hat Linux permission management line to $ HOMEcshrc to view the file permissions, you do not have the execution permission (x). add the following command: chmod a + x filename: Display the environment variable echo $ variable name. set the environment variable csh in Linux/unix: in $ HOME /. add setenv JAVA_HOME/usr/java/jdk1.6.0 setenv PATH $ JAVA_HOME/bin: $ PATH setenv CLASSPATH in cshrc. bash/ksh: In $ HOME /. add JAVA_HOME =/home/tarena/jdk1.6.0 _ 05 CLASSPATH =. :..: $ JAVA_HOME/jre/lib/rt. jar (the directory or jar file where the java class is located. when loading the class in the virtual machine, the virtual machine finds it in CLASSPAHT) PATH = $ JAVA_HOME/bin: $ PATH (the operating system needs to find it in PATH) export JAVA_HOME classpath path source. bash_profile allows global environment variables. effective bash_profile