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How to send a string to stdin in Bash?
Here’s a solution that matches all three conditions: /my/bash/script < < (echo ‘This string will be sent to stdin.’) The < is normal input redirection for stdin. The < (…) is bash process substitution.
Why does stdin not return to the prompt?
On typing the command and hitting enter, you are not returned to your prompt since the console is expecting input to come from stdin; you type line after line of standard input followed by ^D.
How can I send text to an active stdin?
And it can be done by sending this input text to the process’ standard input “file” /proc/PID#/fd/0. However, the input text needs to be sent in a special way to be read by the process. Sending the input text via the regular file write method will not cause the process to receive the text.
How does process substitution send output to stdin?
Process substitution alone, such as in diff < (ls /bin) < (ls /usr/bin), does not send anything to stdin. Instead, the process output is saved into a file, and its path is passed as a command line argument.
How to get information about a process in Aix?
To get information about a process, call the ps command. Pass the -o option to choose what information to output and control the format. AIX has a /proc directory, but its content isn’t the same as Linux (although there are similarities).
Which is normal redirection for stdin in Bash?
The < is normal input redirection for stdin. The < (…) is bash process substitution. Roughly it creates a /dev/fd/… file with the output of the substituting command and passes that filename in place of the < (…), resulting here for example in script < /dev/fd/123. For details, see this answer.
How to pipe multiple lines to stdin in Bash?
Enables one to type multiple lines into a program, without that input being saved in history, nor visible in ps. Just press Ctrl + C when finished typing to end cat. aliases can and can’t process piped stdin…
How to redirect stdin output to another process?
You want to (1) create stdout output in one process (like echo ‘…’) and (2) redirect that output to stdin input of another process but (3) without the use of the bash pipe mechanism. Here’s a solution that matches all three conditions:
How does the readall method in stdin work?
The readAll() method reads all remaining input on standard input and returns it as a string. As an example, the following code fragment reads all of the remaining tokens from standard input and returns them as an array of strings. String[] words = StdIn.readAllStrings(); Differences with Scanner.
What are the functions of the stdin class?
The StdIn class provides static methods for reading strings and numbers from standard input. These functions fall into one of four categories: those for reading individual tokens from standard input, one at a time, and converting each to a number, string, or boolean those for reading characters from standard input, one at a time
How to pass a string to a command?
Bash, ksh and zsh have a convenient syntax to pass a string as input via a temporary file. Note that they always append a newline to the string (even if there’s already one).