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hushlogin exists at the root of a user’s home directory, the ‘Last Login: …’ message when you open a new shell (terminal window) is suppressed. MacOS (and other Unix-like operation systems) sometimes uses the existence of a file in a certain directory as a flag for configuration.įor example, when a file named.
#Os x command tilde not working 2017 update
If you use the touch command on a file that already exists it will update the file’s modification date and change nothing else. You can use the touch command to do this. Sometimes it can be useful to quickly create an empty file. Now we want to actually do something to the files.
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We already know how to navigate and read the file system with cd and ls.
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If you like this series and want to learn Terminal and the shell on macOS in more detail, get my book “ macOS Terminal and Shell“ Managing Files "https:\/\/\/pub\/firefox\/releases\/55.0.3\/mac\/en-US\/Firefox%2055.0.3.dmg",įor more info on plutil and everything property list related read my book: ‘Property Lists, Preferences and Profiles for Apple Administrators’ Posted on Categories Command Line Leave a comment on Parse Binary Property Lists in Finder Metadata Terminal Primer – Part 5 – Managing Files Or JSON: $ xattr -px :kMDItemWhereFroms ~/Download.0.3.dmg | xxd -r -p | plutil -convert json -r -o. You can also have plutil convert the plist data into XML: $ xattr -px :kMDItemWhereFroms ~/Downloads/Firefox\ 55.0.3.dmg | xxd -r -p | plutil -convert xml1 -o. This uses plutil’s -p option to just print the data in a human readable form. Note that the options for xattr changed from -pl to -px which forces the output to be binary data only.Īnd the same command for the ‘WhereFroms’: $ xattr -px :kMDItemWhereFroms ~/Downloads/Firefox\ 55.0.3.dmg | xxd -r -p | plutil -p. We can use xxd to convert the binary representation into actual data and plutil to print the plist: $ xattr -px :kMDItemDownloadedDate ~/Downloads/Firefox\ 55.0.3.dmg | xxd -r -p | plutil -p. Unfortunately the rest of the binary plist data is quite unreadable for humans. The first few bytes in the binary data are bplist which tells us we are working with binary plist format. This attribute is some binary data ( xattr automatically uses binary representation when it detects a nil byte. The contents of the quarantine attribute is a string with some numbers (presumably a hash) the application that downloaded it (Safari) and a UUID. To inspect the contents of the extended attributes in further detail, we have to use the xattr command: xattr -l filename will show all extended attributes, or you can use xattr -pl attributename filename to get just a particular one: $ xattr -pl ~/Downloads/Firefox\ 55.0.3.dmgĬom.apple.quarantine: 0083 59a6b982 Safari E56EFC36-29AB-4F77-89E6-F4264336060F
When you double-click the dmg file to mount it, the system will store the checksum and file system check result in more extended attributes: $ ls ~/Downloads/Firefox\ 1 armin staff 51137761 Aug 30 15:11 /Users/armin/Downloads/Firefox 55.0.3.dmg
This shows the three extended attributes attached to this file, their names and their sizes in bytes. We can further inspect the extended attributes with the option: $ ls ~/Downloads/Firefox\ 1 armin staff 51137761 Aug 30 15:11 /Users/armin/Downloads/Firefox 55.0.3.dmgĬom.tadata:kMDItemDownloadedDate 53 When you look at the downloaded file in the Terminal, you see an after the file mode which tells us this file has additional extended attributes: $ ls -l ~/Downloads/Firefox\ 1 armin staff 51137761 Aug 30 15:11 /Users/armin/Downloads/Firefox 55.0.3.dmg
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For example, when you download a file in Safari, it stores when a file was downloaded and which website and download URL was used.Īs an example, I downloaded the latest Firefox disk image. MacOS and Finder use extended attributes to store plenty of extra information about files. For more info on plutil and everything property list related read my book: ‘Property Lists, Preferences and Profiles for Apple Administrators’
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