What s a sh file

Question

So I am not experienced in dealing with a plethora of file types  and I haven t been able to find much info on exactly what  sh files are  Here s what I m trying to do   I m trying to download map data sets which are arranged in tiles that can be downloaded individually  http   daymet ornl gov gridded  In order to download a range of tiles at once  they say to download their script  which eventually leads to daymet-nc-retrieval sh  https   github com daymet scripts blob master Bash daymet-nc-retrieval sh  So  what exactly am I supposed to do with this code  The website doesn t provide further instructions  assuming users know what to do with it  I m guessing you re supposed to paste the code in to some other unmentioned application for a browser  using Chrome or Firefox in this case   It almost looks like something that could be pasted in to Firefox Greasemonkey  but not quite  Just by a quick Google on the file type I haven t been able to get heads or tails on it    I m sure there s a simple explanation on what to do with these files out there  but it seems to be buried in plenty of posts where people are already assuming you know what to do with these files  Anyone willing to just simply say what needs to be done from square one after getting to the page with the code to actually implementing it  Thanks

User · Answer

sh files are unix  linux  shell executables files  they are the equivalent  but much more powerful  of bat files on windows   So you need to run it from a linux console  just typing its name the same you do with bat files on windows

User · Answer

open the location in terminal then type these commands 1  chmod  x filename sh 2    filename sh that s it

User · Answer

Typically a  sh file is a shell script which you can execute in a terminal  Specifically  the script you mentioned is a bash script  which you can see if you open the file and look in the first line of the file  which is called the shebang or magic line

User · Answer

I know this is an old question and I probably won t help  but many Linux distributions e g   ubuntu  have a  Live cd usb  function  so if you really need to run this script  you could try booting your computer into Linux  Just burn a  iso to a flash drive  here s how http   goo gl U1wLYA   start your computer with the drive plugged in  and press the F key for boot menu  If you choose     USB      you will boot into the OS you just put on the drive

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What is a file with extension  sh   It is a Bourne shell script  They are used in many variations of UNIX-like operating systems  They have no  language  and are interpreted by your shell  interpreter of terminal commands  or if the first line is in the form     path to interpreter   they will use that particular interpreter  Your file has the first line      bin bash   and that means that it uses Bourne Again Shell  so called bash  It is for all practical purposes a replacement for good old sh   Depending upon the interpreter you will have different language in which the file is written   Keep in mind  that in UNIX world  it is not the extension of the file that determines what the file is  see How to execute a shell script    If you come from the world of DOS Windows  you will be familiar with files that have  bat or  cmd extensions  batch files   They are not similar in content  but are akin in design   How to execute a shell script  Unlike some silly operating systems   nix does not rely exclusively on extensions to determine what to do with a file  Permissions are also used  This means that if you attempt to run the shell script after downloading it  it will be the same as trying to  run  any text file  The   sh  extension is there only for your convenience to recognize that file   You will need to make the file executable  Let s assume that you have downloaded your file as file sh  you can then run in your terminal   chmod  x file sh   chmod is a command for changing file s permissions   x sets execute permissions  in this case for everybody  and finally you have your file name   You can also do it in GUI  Most of the time you can right click on the file and select properties  in XUbuntu the permissions options look like this     If you do not wish to change the permissions  You can also force the shell to run the command  In the terminal you can run   bash file sh   The shell should be the same as in the first line of your script   How safe is it   You may find it weird that you must perform another task manually in order to execute a file  But this is partially because of strong need for security   Basically when you download and run a bash script  it is the same thing as somebody telling you  run all these commands in sequence on your computer  I promise that the results will be good and safe   Ask yourself if you trust the party that has supplied this file  ask yourself if you are sure that have downloaded the file from the same place as you thought  maybe even have a glance inside to see if something looks out of place  although that requires that you know something about  nix commands and bash programming    Unfortunately apart from the warning above I cannot give a step-by-step description of what you should do to prevent evil things from happening with your computer  so just keep in mind that any time you get and run an executable file from someone you re actually saying   Sure  you can use my computer to do something

User · Answer

If you open your second link in a browser you ll see the source code      bin bash   Script to download individual  nc files from the ORNL   Daymet server at  http   daymet ornl gov            For ranges use  start  end    for individul vaules  use  1 2 3 4  for year in  2002  2003  do    for tile in  1159  1160          do wget --limit-rate 3m http   daymet ornl gov thredds fileServer allcf   year    tile    year  vp nc -O   tile    year  vp nc           An example using curl instead of wget      do curl --limit-rate 3M -o   tile    year  vp nc http   daymet ornl gov thredds fileServer allcf   year    tile    year  vp nc      done done   So it s a bash script  Got Linux     In any case  the script is nothing but a series of HTTP retrievals  Both wget and curl are available for most operating systems and almost all language have HTTP libraries so it s fairly trivial to rewrite in any other technology  There re also some Windows ports of bash itself  git includes one   Last but not least  Windows 10 now has native support for Linux binaries

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