20171014 tips for manipulating filesystem in julia
This document provides tips for manipulating the filesystem in Julia. It demonstrates how to print the working directory, change directories, make directories, copy and move files, remove files, touch files to update timestamps, get the basename or join paths, split directories or extensions, traverse folders, list directory contents, get file information like timestamps and permissions, create symbolic links, change ownership and permissions, and work with temporary files and directories. Functions demonstrated include pwd(), cd(), mkdir(), cp(), mv(), rm(), touch(), dirname(), basename(), joinpath(), splitdir(), splitdrive(), splitext(), walkdir(), readdir(), stat(), ctime(), mtime(), filemode(), filesize(), uperm(), gperm(), operm(), symlink
20171014 tips for manipulating filesystem in julia
- 1. Tips for Manipulating Filesystem in Julia Julia Taiwan 發起人 杜岳華
- 2. Print working directory julia> pwd() "C:Usersa504082002"
- 3. Change directory julia> cd("D:") julia> pwd() "D:"
- 4. Make directory mkdir(path::AbstractString, mode::Unsigned=0o777) `mkdir` mkpath(path::AbstractString, mode::Unsigned=0o777) `mkdir -p` julia> mkdir("foo")
- 9. Get basename julia> dirname("/home/myuser") "/home" julia> basename("/home/myuser/example.jl") "example.jl"
- 10. Join path julia> joinpath("D:", "foo", "bar") "D:foobar"
- 13. Split extensions julia> splitext("/home/myuser/example.jl") ("/home/myuser/example", ".jl") julia> splitext("/home/myuser/example") ("/home/myuser/example", "")
- 14. Folder traversal for (root, dirs, files) in walkdir(".") println("Directories in $root") for dir in dirs println(joinpath(root, dir)) end println("Files in $root") for file in files println(joinpath(root, file)) end end
- 15. list segment `ls` julia> readdir() 55-element Array{String,1}: ".atom“ ".julia" ".julia_history" ".jupyter" ⋮ "Videos" "「開始」功能表"
- 16. File information julia> f = open("D:opensource video.txt", "r") IOStream(<file D:opensource video.txt>) julia> status = stat(f) StatStruct(mode=100666, size=65) julia> status. blksize blocks ctime device gid inode mode mtime nlink rdev size uid julia> status.ctime 1.488506439013989e9
- 17. File information ctime(file) mtime(file) filemode(file) filesize(path...) uperm(file): owner permission gperm(file): group permission operm(file): other permission
- 18. symbolic link (捷徑) symlink(target::AbstractString, link::AbstractString) `ln –s <target> <link>` readlink(path::AbstractString) -> AbstractString the target location a symbolic link `path` points to
- 19. Change owner or mode chown(path::AbstractString, owner::Integer, group::Integer=-1) chmod(path::AbstractString, mode::Integer; recursive::Bool=false)
- 20. temp tempname(): generate a unique temporary file path tempdir(): generate a unique temporary direcotry path julia> tempname() "C:UsersA50408~1AppDataLocalTempjl_FA AC.tmp" julia> tempdir() "C:UsersA50408~1AppDataLocalTemp"
- 21. Make temp mktemp(parent=tempdir()) mktempdir(parent=tempdir()) julia> mktemp() ("C:UsersA50408~1AppDataLocalTempjl_7586.tmp ",IOStream(<file C:UsersA50408~1AppDataLocalTempjl_7586.tmp>)) julia> mktempdir() "C:UsersA50408~1AppDataLocalTempjl_1A09.tmp"
- 22. Thank you