Transfer output to empty file?

Shell Programming and Scripting
1

Hi all,

I want transfer the echo data into file.txt.how?
echo " $dir $group " >> ${file.txt}

---------- Post updated at 04:11 PM ---------- Previous update was at 03:10 PM ----------

anybody can help ?
i mean in script output like
echo " hello"

i want transfer that output to file.txt.

2

It is not very clear what you are asking for here, so I will take a guess..

To echo simple variables into files use something like:

echo "$dir $group" >> file.txt

However if you want to echo variables into a filename that is held in a variable:

fname="file.txt"
echo "$dir $group" >> $fname

Please note that ">>" appends to the file. If you want to create the file new each time just use one redirect ">"

I would recommend searching for "simple shell script tutorial" on your favourite search engine.

I hope this helps.

3

hi citaylor,

then i need to set as variable in my script?

4

The first example is an example of a hard-coded file name, ie "file.txt".
The second example is an example of a file name kept in a variable that is usually set in the script.
Another example is:

#!/bin/sh
echo "$dir $group" >> $1

"$1" is special, it means use the first argument passed to the shell script, so if you then ran the shell script, for example "./script foo.txt" then the output would be stored in foo.txt

6

Hi

if i want get the output of $fname ?how i going to type the code?
because i type echo $fname nothing come out.