Export command-linux

Export command-linuxexport command function description: sets or displays environment variables. Syntax: export [-fnp] [variable name] [variable setting value] Supplementary Note: When executing a program in shell, shell provides a set of environment variables. Export allows you to add, modify, or delete environment variables. For more information, see setting or displaying environment variables. Syntax: export [-fnp] [variable name] = [variable setting value] Supplementary Note: When executing a program in shell, shell provides a set of environment variables. Export allows you to add, modify, or delete environment variables for subsequent programs. The effect of export is only true for this login operation. Parameter:-f indicates the function name in [variable name. -N: delete the specified variable. The variable is not actually deleted, but is not output to the execution environment of subsequent commands. -P: list all environment variables that the shell assigns to the program. When configuring the cross-compilation tool chain in export PATH, you must specify the PATH of the compilation tool and set the environment variable. For example, my mips-linux-gcc compiler is in the "/opt/au1200_rm/build_tools/bin" directory. 1. run the export command: # export PATH = $ PATH: /opt/au1200_rm/build_tools/bin to view the configured environment variables: # exportdeclare-x BASH_ENV = "/root /. bashrc "declare-x G_BROKEN_FILENAMES =" 1 "declare-x HISTSIZE =" 1000 "declare-x HOME ="/root "declare-x HOSTNAME =" localhost. localdomain "declare-x PATH ="/usr/lib/ccache:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin: /usr/bi N:/root/bin: /root/ccy/buildroot-gcc342/bin/"declare-x INPUTRC ="/etc/inputrc "declare-x PWD ="/opt/au1200_rm/build_tools/bin "declare-x SHELL = "/bin/bash" declare-x SHLVL = "1" # echo $ PATH/usr/lib/ccache: /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin: /root/ccy/buildroot-gcc342/bin/2, modify the profile File: below # vi/etc/profile to add: export PATH = "$ PATH: /opt/au1200_rm/build_tools/bin" 3. modify. bashrc file: # vi/root /. bashrc adds: export PATH = "$ PATH:/opt/au1200_rm/build_tools/bin" # echo $ PATH to check whether the PATH/my_new_path is already in the output. Also: 4. modify/etc/re. local File: # vi/etc/re. add: export PATH = "$ PATH:/opt/au1200_rm/build_tools/bin" to the local file"