pushd popd – top 5 tips

when you enter …. this is what the shell does for you.

pushd dirA ###  1) push current dir, 2) push dirA, 3) Enter (i.e. cd into) dir1 i.e. the new top

popd ### without arg — means 1) pop 2) Enter the new top in the stack. I guess the item “removed” is forgotten completely.
–Gory details
### I feel top item is always, always kept in sync with current dir. An understanding of the stack is essential. The stack is shared by cd, pushd, popd.
pushd ### without arg — means 1) swap top 2 on the stack. 2) “Enter” (i.e. cd into) new top
cd – ### a single dash — means “Enter” previous directory (in history, not the stack). Overwrite top.
pushd +2 ### means 1) identify the 3rd (not 2nd) on the stack. Rotate it to top. 2) Enter new top

cd dir1 # replace top item on the stack with dir1
dirs -v # print stack. Readonly operation.
popd +2 # identify the 3rd (not 2nd) on the stack and remove it. Don’t change current directory, since top is unaffected.
popd +0 # Probably pop the top. Enter the new top.

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