CODEWITHSUNDEEP
linuxterminalsh
gashthrasher
gashthrasher

Reputation: 31

How to save linux command line outputs to a .txt file?

I would like to make a .sh executable that inputs a terminal command, and saves the output to a .txt file.

For example, take the output of i2cdump and save to a file. The terminal commands for this are

i2cdump -r -y 0x0-6 0 0x68
"outputs the specified bytes 0x0-6 to terminal window"

How can I use a .sh executable to do this automatically, and save the output to a file stored in /dir/?

Some pseudo code I have for myfile.sh:

#!/bin/bash

output=$(i2cdump -r -y 0x0-6 0 0x68)
FILE * fp;
// write output to file
// save to directory
close(fp)

Upvotes: 2

Views: 2142

Answers (2)

Dan Baruch
Dan Baruch

Reputation: 1093

Any command can have > appended to it to redirect the output. As in:

echo "foo" > /path/to/file

Note, there are two things you should know: 1 ">" is overwriting a file while >> is appending. As in:

echo "foo" > /path/to/file

file content will be:

foo

while

echo "foo" > /path/to/file
echo "foo2" >> /path/to/file

file content will be:

foo

foo2

And also, if you want to redirect errors you can use the 2 operand. As in:

cat /path/to/non-existing-file 2> /outputfile

Will write all the operation's error into outputfile. The same > and >> logic applies.

Upvotes: 1

Darnuria
Darnuria

Reputation: 166

You can using shell redirection like so:

echo "Hello world" > greetings.txt

Or to suit your needs:

#!/bin/bash

i2cdump -r -y 0x0-6 0 0x68 > output.txt
# closing is automatic at the end of redirecting.

General information about shell redirection of standart output stream in Bash manual: Redirections

Upvotes: 2

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