Create get-info.md

Author: MichaelCurrin

cheatsheets/shell/get-info.md

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+# Get info
+
+
+## which
+
+Alias:
+
+```console
+$ which ls
+ls is an alias for ls -G`
+```
+
+Function:
+
+```console
+$ which upgrade-deps
+upgrade-deps () {
+if [[ -n "$(git status --porcelain)" ]]
+then
+...
+```
+
+
+## Type
+
+```console
+$ type upgrade-deps
+upgrade-deps is a shell function from /Users/mcurrin/.aliases`
+```
+
+```console
+$ type ls
+ls is an alias for ls -G
+```
+
+
+## ln
+
+Check if a symlink is valid.
+
+If valid:
+
+```console
+$ ln -s abc def
+$ ln def
+ln: ./def: File exists
+```
+
+If not valid:
+
+```console
+$ ln -s abc def
+$ rm abc
+$ ln def
+ln: def: No such file or directory
+```