Move pages under tldr, lint run.sh, update docs

tldr/fastmod

@@ -0,0 +1,34 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# fastmod
+
+> A fast partial replacement for the codemod tool, replace and replace all in the whole codebase.
+> Regexes are matched by Rust regex crate.
+> More information: <https://github.com/facebookincubator/fastmod>.
+
+- Replace a regex pattern in all files of the current directory, ignoring files on .ignore and .gitignore:
+
+`fastmod {{regex_pattern}} {{replacement}}`
+
+- Replace a regex pattern in case-insensitive mode in specific files or directories:
+
+`fastmod --ignore-case {{regex_pattern}} {{replacement}} -- {{path/to/file path/to/directory ...}}`
+
+- Replace a regex pattern in a specific directory in files filtered with a case-insensitive glob pattern:
+
+`fastmod {{regex}} {{replacement}} --dir {{path/to/directory}} --iglob {{'**/*.{js,json}'}}`
+
+- Replace for an exact string in .js or .json files:
+
+`fastmod --fixed-strings {{exact_string}} {{replacement}} --extensions {{json,js}}`
+
+- Replace for an exact string without prompt for a confirmation (disables regular expressions):
+
+`fastmod --accept-all --fixed-strings {{exact_string}} {{replacement}}`
+
+- Replace for an exact string without prompt for a confirmation, printing changed files:
+
+`fastmod --accept-all --print-changed-files --fixed-strings {{exact_string}} {{replacement}}`