20
votes
4answers
10k views

How to redirect stderr,out to different files and also display in terminal?

To make it clear, I want to see the output of a command in the terminal as if there were no redirection. Also stderr need to be redirected to err.log and stdout need to be redirected to stdout.log. ...
15
votes
3answers
14k views

Execute a line of commands with one sudo

For example if I want to create a file and enter text in one line I can redirect the output into a file with the use of the > operator: echo "something" > /path/foobar but if I don't have ...
10
votes
1answer
6k views

Why can't sudo redirect stdout to /etc/file, but sudo 'nano' or 'cp' can? [duplicate]

Why does redirection, using sudo give me an error for the following commands? $ sudo printf "foo" >/etc/file bash: /etc/file: Permission denied $ sudo printf "foo" ~/file; cat ~file >/etc/...
9
votes
4answers
2k views

sudo permission denied but su grants permission

this is the first occurrence where su was required for me. I read an article about changing the value in /sys/devices/virtual/backlight/acpi_video0/brightness to alter my laptop's screen brightness. ...
9
votes
7answers
2k views

Emptying a file for root user does not work [duplicate]

I use below command to empty a file > file.txt It works perfectly fine! But there are some files with root user permissions. So I tried sudo > different-file.txt and I got below verbose ...
9
votes
2answers
1k views

How do I append text to a write protected file [duplicate]

Possible Duplicate: Redirecting stdout to a file you don't have write permission on I am trying to append a line of text to a write protected file. I tried to accomplish this with sudo ...
8
votes
3answers
11k views

bash: /dev/stderr: Permission denied

After upgrading to a new release version, my bash scripts start spitting errors: bash: /dev/stderr: Permission denied in previous versions Bash would internally recognize those file names (which is ...
6
votes
2answers
11k views

tail program output to file in Linux

I know we can use below format to redirect the screen output to a file: $ your_program > /tmp/output.txt However when I used below command, it says "-bash: /home/user/errors.txt: Permission ...
4
votes
4answers
987 views

where should I put the sudo in this command? [duplicate]

Possible Duplicate: Redirecting stdout to a file you don't have write permission on echo "some words" >> /etc/apt/source.list permission denied sudo echo "some words" >> /...
4
votes
3answers
2k views

How do I use redirection with sudo [duplicate]

Possible Duplicate: Redirecting stdout to a file you don't have write permission on Yeah I could (and probably will) just escalate to root, but I'd like to know why this doesn't work? ...
4
votes
4answers
9k views

Unable to write to a GPIO pin despite file permissions on /sys/class/gpio/gpio18/value

This is on a Raspberry Pi. Here's the output of sudo ls -lL /sys/class/gpio/gpio18: -rwxrwx--- 1 root gpio 4096 Mar 8 10:50 active_low -rwxrwx--- 1 root gpio 4096 Mar 8 10:52 ...
3
votes
2answers
8k views

How to insert text into a root-owned file using sudo? [duplicate]

Possible Duplicate: Redirecting stdout to a file you don't have write permission on Running a command like sudo echo 'text' >> /file.txt fails with: bash: /file.txt: Permission ...
3
votes
2answers
46 views

modify text file with only one number subject to constraints

I have a text file a.txt whose content is a number between 0 and 100. I need a single command which modifies a.txt by increasing by 10 the number, but under the constraint that the final result has to ...
3
votes
2answers
2k views

insert text in a file using echo command [duplicate]

I am trying to insert some text in a file in the following way sudo echo "abc-abc/abc/abc" >> /etc/portage/make.conf but it give me the error Permission denied although I am using sudo ...
3
votes
1answer
697 views

Redirecting output in the shell, permissions

I have a question about permissions. Distro: Debian GNU/Linux 6.0.4 (squeeze) So I have a folder with a php script in it. Both folder and file are owned by User1 If I do this: php script.php I ...

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