19
votes
Accepted
Why does bash with "here documents" redirection start as interactive?
Why is this happening? Why is bash interactive in this case?
It isn't.
The outer - interactive - shell is expanding $- (the quotes aren't special in this context - compare bash -c "echo '$-'&...
- 83.8k
13
votes
Zsh clear scrollback buffer
function clear-scrollback-buffer {
# Behavior of clear:
# 1. clear scrollback if E3 cap is supported (terminal, platform specific)
# 2. then clear visible screen
# For some terminal 'e[3J' ...
- 1,992
13
votes
Accepted
Is possible to define a bash script to run interactively by default?
If you add the -i option to your hashbang(s) it will specify that the script runs in interactive mode.
#!/bin/bash -i
Alternatively you could call the scripts with that option:
bash -i /path/to/...
- 41.5k
13
votes
Accepted
Is there some interactive analogue of `mktemp` that helps to organize throw-away directories?
It doesn’t quite cover all the features you mention (easily making the temporary directory persistent), but I rather like Kusalananda’s shell for this. It creates a temporary directory, starts a new ...
- 481k
12
votes
Accepted
How to choose a response for interactive prompt during installation from a shell script
Configure the debconf database:
echo "wireshark-common wireshark-common/install-setuid boolean true" | sudo debconf-set-selections
Then, install Wireshark:
sudo DEBIAN_FRONTEND=noninteractive apt-...
- 256
10
votes
How can I make rm -rf ask for confirmation just once at the directory level?
With some rm implementations (DragonFly BSD where it comes from, FreeBSD and GNU at least), the -I (capital i) is what you are looking for.
-i asks for confirmation for every file, while the -I (...
- 598
9
votes
How can I disable the new history feature in Python 3.4?
As of Python 3.6, you can use readline.set_auto_history to disable this:
import readline
readline.set_auto_history(False)
- 4,146
8
votes
Is possible to define a bash script to run interactively by default?
Sourcing your .bashrc is not a good idea. You could create a .bash_alias file with your alias and then source that file in your script and use shopt
something like:
shopt -s expand_aliases
source ~/....
- 731
7
votes
Accepted
Copying files interactively: "cp: overwrite"
The POSIX standard only specifies that the response need to be "affirmative" for the copying to be carried out when -i is in effect.
For GNU cp,
the actual input at that point is handled by a ...
- 356k
6
votes
Accepted
Making mysql CLI ask me for a password interactively
Just have the user store the variable beforehand with read:
echo "Please enter password for user ${domain}: "; read -s psw
mysql -u root -p << MYSQL
create user '${domain}'@'localhost' ...
- 32.4k
6
votes
Why doesn't bash recognize alias in interactive mode?
So there is a hidden character in your command. This is copied directly out of your question:
$ echo -n 'GCOM "\pushdict now ignores prefix macro."' | od -c
0000000 G C O M 342 200 ...
- 41.5k
5
votes
Accepted
Non-ascii chars are no longer displayed in bash
I'd say most likely your terminal is misconfigured and sends and displays characters in some single-byte character set, probably ISO8859-1 or ISO8859-15 given the sample characters you show instead of ...
- 584k
5
votes
interactive SMTP command using telnet via a shell script
telnet fails for a variety of reasons. First up, if you strace it the relevant errors are telnet wanting a TTY on standard input, of which there is none (because of the redirect) so telnet fails.
$ ...
- 35.8k
5
votes
Run script in a non interactive shell?
To run your script in a non-interactive shell (not regarding the details of cron), you can do this via ssh.
Test if you really end up in a non-interactive shell:
> ssh someuser@somehost tty
not a ...
- 163
5
votes
Accepted
Is it possible to begin a sudo interactive session and also provide an initial command?
You could use --rcfile to tell bash to read your ps1.sh file instead of the service_user's .bashrc:
sudo -i -u service_user bash --rcfile /home/me/ps1.sh
The execution flow then will be something ...
- 77.8k
4
votes
Why is Linux allowed to become unresponsive?
There is a workaround for the thrashing problem: to automatically limit system ressources per process user you can utilize the pam_limits module (via limits.conf) on Linux (CentOS and similar) or ...
- 229
4
votes
Accepted
Can you enumerate all the ways to start an interactive shell?
“unless -s is specified” qualifies “without non-option arguments”. The synopsis for bash is
bash [options] [command_string | file]
Non-option arguments are command_string or file. If you specify ...
- 481k
4
votes
Is there some interactive analogue of `mktemp` that helps to organize throw-away directories?
I just use cd $(mktemp -d) and then hack away. In general, the stuff exists for as long as I need it, but it goes away without any action on my part.
I think my OS is configured (by default not by ...
- 472
4
votes
Accepted
> symbol appearing when interactively defining function in bash
This has nothing to do with you installing nushell. It also does not stop the shell from functioning correctly.
The > is the default value of the shell's secondary prompt (PS2). The secondary ...
- 356k
3
votes
Accepted
Confused about determining if a shell script is running interactively
A shell script is, unless it's sourced by an interactive shell, very seldom run in an interactive shell environment. This means that $- would not include an i.
What you could check is to see whether ...
- 356k
3
votes
Accepted
sh: is there a command to interactively edit the PWD?
For bash and any other shell supporting readline you might be able to use this function
icd() { local a; read -ei "${1:-$PWD}" -p "$FUNCNAME> " a && cd "$a"; }
Usage
icd # Starts ...
- 128k
3
votes
Start new shell with positional parameters
You can use the -s option for that. From the POSIX description of sh:
sh -s [-abCefhimnuvx] [-o option]... [+abCefhimnuvx] [+o option]...
[argument...]
-s
Read commands from the standard ...
- 77.8k
3
votes
Why no such non-interactive version of bashrc?
The conception function of ~/.bashrc file is to initiate correctly any shell which is:
not the login shell,
an interactive shell.
Clearly the function of this shell script is to initiate environment ...
- 1,085
3
votes
Accepted
Why no such non-interactive version of bashrc?
You already have the opportunity to set BASH_ENV to the pathname of a file that non-interactive shell script parse before running.
This allows you to do, in a crontab for example
@hourly BASH_ENV="$...
- 356k
3
votes
Accepted
Confused about the meaning of an interactive and non-interactive shell when running a script
A shell running a script is a non-interactive shell.
A non-interactive shell can still use e.g. read to read data from standard input.
If standard input is a terminal, this may provide a level of "...
- 356k
3
votes
Accepted
rm -iR does not work inside a loop
1. Why you example did not work as expected
rm's prompts need STDIN to receive your feedback. In your example you used STDIN to pipe a list to the while loop though, thus rm was getting the answers ...
- 1,088
3
votes
Which file is loaded and executed by a non-interactive non-login shell?
From man bash, in a non-interactive shell the BASH_ENV environment variable is evaluated and its content is sourced. So you could use that environment variable to specify a file with your environment ...
- 6,632
3
votes
Accepted
PasswordAuthentication=no flag does not work on one strange host
debug1: Next authentication method: keyboard-interactive
You're being prompted for "keyboard-interactive" authentication, which is technically separate from "password" ...
- 3,587
3
votes
Accepted
Running a program outside of terminal
The background process:
detaches from the terminal (setsid);
runs xdg-open.
If the terminal disappears before step 1 is finished, the whole process group receives a SIGHUP and is killed. setsid ...
3
votes
Does tmux run-shell support interactive shell?
tmux run-shell subcommand does not work with programs that require tty. This explains why read fails when running in interactive mode[1] and also why
tmux run-shell "echo start; read -p \"...
- 409
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