Update cheatsheets

pushd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pushd
+
+> Place a directory on a stack so it can be accessed later.
+> See also `popd` to switch back to original directory and `dirs` to display directory stack contents.
+> More information: <https://www.gnu.org/software/bash/manual/html_node/Directory-Stack-Builtins.html>.
+
+- Switch to directory and push it on the stack:
+
+`pushd {{path/to/directory}}`
+
+- Switch first and second directories on the stack:
+
+`pushd`
+
+- Rotate stack by making the 5th element the top of the stack:
+
+`pushd +4`
+
+- Rotate the stack 4 times to the left (the current directory stays at the top by replacing the 5th element):
+
+`pushd -n +4`