Create , Write and Save file from a Shell script
For more complex sequences of commands you should consider using the cat
command with a here document. The basic format is
command > file << END_TEXT
some text here
more text here
END_TEXT
There are two subtly different behaviors depending whether the END_TEXT label is quoted or unquoted:
unquoted label: the contents are written after the usual shell expansions
quoted label: the contents of the here document are treated literally, without the usual shell expansions
For example consider the following script
#!/bin/bash
var1="VALUE 1"
var2="VALUE 2"
cat > file1 << EOF1
do some commands on "$var1"
and/or "$var2"
EOF1
cat > file2 << "EOF2"
do some commands on "$var1"
and/or "$var2"
EOF2
The results are
$ cat file1
do some commands on "VALUE 1"
and/or "VALUE 2"
and
$ cat file2
do some commands on "$var1"
and/or "$var2"
If you are outputting shell commands from your script, you probably want the quoted form.
There is no need to mess about with an editor to do this.
You can append something to a file with a simple echo command. For example
echo "Hello World" >> txt
Will append "Hello world" to the the file txt
. if the file does not exist it will be created.
Or if the file may already exist and you want to overwrite it
echo "Hello World" > txt
For the first line: and
echo "I'm feeling good" >> txt
echo "how are you" >> txt
For subsequent lines.
At it's simplest the .sh
script could just contain a set of echo commands.