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Shell study note
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5.1
printenv | view Global variables |
bash | new shell |
set | Global variables and local variables |
export test | Local → Global, so it can be accessed in both subshell and main shell. |
unset test | Delete a variable, no $ needed. |
PATH=$PATH:... | append PATH, no “” needed, export needed to make it global. |
.bashrc | define own aliases |
User-definedvariables are lower-cased; while sys variables are upper.
test=testing;
remember there isno BLANK;
bash: new a shell,the subshell has no $test variable for it is user-defined; so it iswith the subshell.
To fix this, we can “export test”, and NO $ needed.
When unset a globalvar, it only influent the subshell who execute this cmd.
Shell study note
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