How to write multiple line string using Bash with variables

Question

How can I write multi-lines in a file called myconfig conf using BASH      bin bash kernel  2 6 39   distro  xyz    echo  lt  lt  lt  EOL line 1    kernel  line 2  line 3    distro  line 4 line     EOL  gt  gt   etc myconfig conf  cat  etc myconfig conf

User · Answer

The heredoc solutions are certainly the most common way to do this. Other common solutions are:

echo 'line 1, '"${kernel}"'
line 2,
line 3, '"${distro}"'
line 4' > /etc/myconfig.conf

and

exec 3>&1 # Save current stdout
exec > /etc/myconfig.conf
echo line 1, ${kernel}
echo line 2, 
echo line 3, ${distro}
...
exec 1>&3  # Restore stdout

User · Answer

If you do not want variables to be replaced  you need to surround EOL with single quotes   cat  gt  tmp myconfig conf  lt  lt  EOL  line 1    kernel  line 2   line 3    distro  line 4 line      EOL   Previous example     cat  tmp myconfig conf  line 1    kernel  line 2   line 3    distro  line 4 line

User · Answer

The syntax   lt  lt  lt   and the command used  echo  is wrong   Correct would be      bin bash  kernel  2 6 39  distro  xyz  cat  gt  etc myconfig conf  lt  lt EOL line 1    kernel  line 2   line 3    distro  line 4 line      EOL  cat  etc myconfig conf   This construction is referred to as a Here Document and can be found in the Bash man pages under man --pager  less -p   s Here Documents   bash

User · Answer

bin bash kernel  2 6 39   distro  xyz    cat  gt   etc myconfig conf  lt  lt  EOL line 1    kernel  line 2  line 3    distro  line 4 line     EOL   this does what you want

User · Answer

Below mechanism helps in redirecting multiple lines to file  Keep complete string under   so that we can redirect values of the variable      bin bash kernel  2 6 39  echo  line 1    kernel  line 2    gt  a txt echo  line 2    kernel  line 2    gt  b txt   Content of a txt is   line 1  2 6 39 line 2    Content of b txt is  line 2    kernel  line 2

User · Answer

I m using Mac OS and to write multiple lines in a SH Script following code worked for me     bin bash FILE NAME  quot SomeRandomFile quot   touch  FILE NAME  echo  quot  quot  quot I wrote all the   stuff here  And to access a variable we can use  FILE NAME     quot  quot  quot   gt  gt   FILE NAME  cat  FILE NAME  Please don t forget to assign chmod as required to the script file  I have used chmod u x myScriptFile sh

[linux] How to write multiple line string using Bash with variables?

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