How to concatenate two strings to build a complete path

Question

I am trying to write a bash script  In this script I want user to enter a path of a directory  Then I want to append some strings at the end of this string and build a path to some subdirectories  For example assume user enters an string like this    home user1 MyFolder   Now I want to create 2 subdirectories in this directory and copy some files there    home user1 MyFolder subFold1  home user1 MyFolder subFold2   How can I do this

User · Answer

I was working around with my shell script which need to do some path joining stuff like you do.

The thing is, both path like

/data/foo/bar

/data/foo/bar/

are valid.

If I want to append a file to this path like

/data/foo/bar/myfile

there was no native method (like os.path.join() in python) in shell to handle such situation.

But I did found a trick

For example , the base path was store in a shell variable

BASE=~/mydir

and the last file name you wanna join was

FILE=myfile

Then you can assign your new path like this

NEW_PATH=$(realpath ${BASE})/FILE

and then you`ll get

$ echo $NEW_PATH

/path/to/your/home/mydir/myfile

the reason is quiet simple, the "realpath" command would always trim the terminating slash for you if necessary

User · Answer

The POSIX standard mandates that multiple   are treated as a single   in a file name  Thus   dir   subdir    file is the same as  dir subdir file   As such concatenating a two strings to build a complete path is a simple as   full path   part1  part2

User · Answer

Won t simply concatenating the part of your path accomplish what you want     base   home user1 MyFolder     subdir  subFold1    new path  base subdir   echo  new path  home user1 MyFolder subFold1   You can then create the folders directories as needed   One convention is to end directory paths with    e g   home   because  paths starting with a   could be confused with the root directory   If a double slash      is used in a path  it is also still correct   But  if no slash is used on either variable  it would be incorrect  e g   home user1 MyFoldersubFold1

User · Answer

bin bash  read -p  Enter a directory    BASEPATH  SUBFOLD1   BASEPATH     subFold1 SUBFOLD2   BASEPATH     subFold2  echo  I will create  SUBFOLD1 and  SUBFOLD2     mkdir -p  SUBFOLD1   mkdir -p  SUBFOLD2   And if you want to use readline so you get completion and all that  add a -e to the call to read   read -e -p  Enter a directory    BASEPATH

User · Answer

This should works for empty dir  You may need to check if the second string starts with   which should be treat as an absolute path        bin bash  join path         echo    1   1   2    sed  s      g     join path    a bin join path   data  a bin join path   data   a bin   Output   a bin  data a bin  data a bin   Reference  Shell Parameter Expansion

User · Answer

usr bin env bash  mvFiles         local -a files   file1 file2                      subDirs   subDir1 subDir2                  subDirs      subDirs       baseDir           mkdir -p    subDirs         return 1      local x     for x in    subDirs       do         cp    files        x      done      main         local baseDir        -t 1     amp  amp  echo  Enter a path       read -re baseDir     mvFiles   baseDir     main

User · Answer

The following script catenates several  relative absolute  paths  BASEPATH  with a relative path  SUBDIR    shopt -s extglob SUBDIR  subdir  for BASEPATH in      base base  base    base  base   base    do   echo  BASEPATH      BASEPATH   -- gt    BASEPATH         BASEPATH     SUBDIR  done   The output of which is   BASEPATH      -- gt  subdir BASEPATH       -- gt   subdir BASEPATH    base  -- gt  base subdir BASEPATH    base   -- gt  base subdir BASEPATH    base    -- gt  base subdir BASEPATH     base  -- gt   base subdir BASEPATH     base   -- gt   base subdir BASEPATH     base    -- gt   base subdir   The shopt -s extglob is only necessary to allow BASEPATH to end on multiple slashes  which is probably nonsense   Without extended globing you can just use   echo   BASEPATH      BASEPATH     SUBDIR   which would result in the less neat but still working   BASEPATH      -- gt  subdir BASEPATH       -- gt   subdir BASEPATH    base  -- gt  base subdir BASEPATH    base   -- gt  base subdir BASEPATH    base    -- gt  base  subdir BASEPATH     base  -- gt   base subdir BASEPATH     base   -- gt   base subdir BASEPATH     base    -- gt   base  subdir

[linux] How to concatenate two strings to build a complete path

Examples related to linux

Examples related to bash