diff --git a/osx/curl.md b/osx/curl.md
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+# curl
+
+- Transfers data from or to a server
+- Supports most protocols including HTTP, FTP, POP
+
+## Head request
+
+`curl --head http://localhost`
+
+## Send form-encoded data
+
+`curl --data name=bob http://localhost/form`
+
+## Send JSON data
+
+`curl -X POST -H "Content-Type: application/json" -d '{"name":"bob"}' http://localhost/login`
+
+## Specify an HTTP method
+
+`curl -X DELETE http://localhost/item/123`
diff --git a/osx/grep.md b/osx/grep.md
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+# grep
+
+- Matches patterns in input text
+- Supports simple patterns and regular expressions
+
+## Search for an exact string
+`grep something FILE`
+
+## Use a regex instead of a word
+
+`grep -e ^regex$ FILE`
+
+## See 3 lines of context
+
+`grep -C 3 something FILE`
+
+## Print the count of matches
+
+`grep -c something FILE`
+
+## Use the standard input instead
+
+`cat FILE | grep something`
diff --git a/osx/less.md b/osx/less.md
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+# less
+
+- Opens a file for reading
+- Allows movement and search
+- Doesn't read the entire file (suitable for logs)
+
+## Open a file
+
+`less source_file`
+
+## Page up / down
+
+`d (next), D (previous)`
+
+## Start / end of file
+
+`g (start), G (end)`
+
+## Search for a string
+
+`/something    then   n (next), N (previous)`
+
+## Exit
+
+`q`
diff --git a/osx/ps.md b/osx/ps.md
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+# ps
+
+- Information about running processes
+
+## List all running processes
+
+`ps aux`
diff --git a/osx/scp.md b/osx/scp.md
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+# scp
+
+- Copies files between hosts on a network
+- Works over a secure connection (SSH)
+
+## Uploading a file
+
+`scp local_file 10.0.0.1:/remote/path/filename`
+
+## Uploading a directory
+
+`scp -r local_folder 10.0.0.1:/remote/path/`
+
+## Downloading a file
+
+`scp 10.0.0.1:/remote/path/filename local_file`
+
+## Specifying credentials
+
+`scp local_file my_user@10.0.0.1:/remote/path`
diff --git a/osx/tar.md b/osx/tar.md
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+# tar
+
+- Archiving utility
+- Supports tar / gzip / bzip
+
+## create an archive from files
+
+`tar cf target.tar file1 file2 file3`
+
+## create a gzipped archive
+
+`tar cfz target.tar.gz file1 file2 file3`
+
+## extract an archive in a target folder
+
+`tar xf source.tar -C folder`