Create text file and fill it using bash

Question

I need to create a text file  unless it already exists  and write a new line to the file all using bash   I m sure it s simple  but could anyone explain this to me

User · Answer

Your question is a a bit vague   This is a shell command that does what I think you want to do   echo  gt  gt  name of file

User · Answer

If you re wanting this as a script  the following Bash script should do what you want  plus tell you when the file already exists       bin bash if   -e  1    then   echo  File  1 already exists   else   echo  gt  gt   1 fi   If you don t want the  already exists  message  you can use      bin bash if     -e  1    then   echo  gt  gt   1 fi   Edit about using   Save whichever version with a name you like  let s say  create file   quotes mine  you don t want them in the file name    Then  to make the file executatble  at a command prompt do   chmod u x create file   Put the file in a directory in your path  then use it with   create file NAME OF NEW FILE   The  1 is a special shell variable which takes the first argument on the command line after the program name  i e   1 will pick up NAME OF NEW FILE in the above usage example

User · Answer

Creating a text file in unix can be done through a text editor  vim  emacs  gedit  etc   But what you want might be something like this  echo  insert text here   gt  myfile txt   That will put the text  insert text here  into a file myfile txt  To verify that this worked use the command  cat    cat myfile txt   If you want to append to a file use this  echo  append this text   gt  gt  myfile txt

User · Answer

Assuming you mean UNIX shell commands  just run  echo  gt  gt  file txt   echo prints a newline  and the  gt  gt  tells the shell to append that newline to the file  creating if it doesn t already exist   In order to properly answer the question  though  I d need to know what you would want to happen if the file already does exist  If you wanted to replace its current contents with the newline  for example  you would use  echo  gt  file txt   EDIT  and in response to Justin s comment  if you want to add the newline only if the file didn t already exist  you can do  test -e file txt    echo  gt  file txt   At least that works in Bash  I m not sure if it also does in other shells

User · Answer

bin bash file location  home test  1 json if   -e  policy    then   echo  File  1 json already exists   else   cat  gt   file location  lt  lt EOF          contact                name    xyz              phonenumber      xxx-xxx-xxxx                EOF fi   This code checks if the given JSON file of the user is present in test home directory or not  If it s not present it will create it with the content  You can modify the file location and content according to your needs

[unix] Create text file and fill it using bash

Examples related to unix