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export

Time:10-08

1. The role of export environment variable, is a new modification and deletion for the use of the sequential execution procedure,
2. The export only applies to the login operation when time, disconnect the background, environment variables or previous value,
3. The export to use
3.1 the most direct export a=1, changing the environment variable to 1,
3.2 other
Export -p print all the shell program, given the environment variables