Questions tagged [here-document]

Question 1

For a school project, I am tasked with making my own (simplified) shell, with bash being the reference point. This includes replicating heredoc behavior which was fun until I stumbled upon variable ...

Question 2

First, I do know this is a security risk. I do know about ssh keys and sshpass. This belongs to a fun project. I wondered if a bash Here-Document could be used as a password input for ssh. I ...

Question 3

Consider the following script: #!/bin/bash foo=Hello bar=Word cat <<EOF No quotes single word delimiter expands $foo $bar EOF cat <<'EOF' Single-quoted single word delimiter does not ...

Question 4

I found the following in man bash as a definition of interactive shell: An interactive shell is one started without non-option arguments (unless -s is specified) and without the -c option whose ...

Question 5

Show lines passed by here-document in the stdout: cat <<EOF foo bar baz EOF foo bar baz I want to match some string with grep via pipe: cat <<EOF foo bar baz EOF |grep 'ba' Why can't ...

Question 6

This code works fine on Linux but not Mac OS: #!/usr/bin/env bash foo=$(cat <<EOF "\[^"\]+" EOF ) printf "%s" "$foo" It fails on Mac with ./test.sh: line 6: ...

Question 7

I do some automatic checks and want to send a mail if a file has changed. I want the mail body to contain the new version of the file, some static text and the old version of the file, so what I do is ...

Question 8

This very simplified version of my script #!/usr/bin/env bash example="$(bash -rs <<'BASH' -- 'This has been executed in restricted shell' echo "$1" BASH )" echo "$...

Question 9

I have this command to run a checksum in some software I want to install: echo "85762db0edc00ce19a2cd5496d1627903e6198ad850bbbdefb2ceaa46bd20cbd install.sh" | sha256sum -c But I would like ...

Question 10

Assuming I have a variable v="c d e f g" and a file with the content: line1 $v line3 How can I make a bash script print this file with the content of the variable in line 2 as if I was ...

Question 11

How is one supposed to write this? print <<EOF; if $x bla EOF I think it is called postfix notation, and a here-doc. I get a syntax error. OK, I guess I'll just use print "bla" if $x; ...

Question 12

I usually run server scripts like this, with a here-document. But when I test if a directory exists, the script continues even though the test fails -- why? ssh $user@$ip /bin/bash <<SCRIPT if [...

Question 13

I have a bash script that connects to a remote machine via SSH and runs a series of commands. It seems that the heredoc within the outer script is not aligning properly, and I keep getting an error. -...

Question 14

This converts 'a' to 'A'. sed 's/a/A/g' <(echo "foobar") foobAr This supplies the commands necessary to make each vowel upper-case: $ cat << EOF s/a/A/g s/e/E/g s/i/I/g s/o/O/g s/u/...

Question 15

When I run buildah, I typically use a heredoc, ctr=$(buildah from alpine:3); buildah run $ctr sh -- <<EOF apk update; apk add git; EOF buildah commit $ctr heredoc_demo; However, when I ...

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Questions tagged [here-document]

bash variable substitution inside heredoc delimiter: how does it work? [duplicate]

Using Here-Document as password Input for ssh

Is it possible to define a bash heredoc with a multi-word delimiter that expands variables?

Why does bash with "here documents" redirection start as interactive?

How can I use a here-document on the left-hand side of a pipeline? [duplicate]

How can I assign a heredoc to a variable in a way that's portable across Unix and Mac?

Cat file and heredoc to pipe

Bash 4: unexpected EOF while looking for matching `)'

"Here Document" as a Single Line Command?

How can I pass variables to a file printed from outside a bash script?

How to combine ...if $x and a here-doc in perl? [closed]

Testing for dir via ssh script - nothing happens

How to use heredoc inside my ssh command

How to pass a script-file to sed as a heredoc?

How can I supply a heredoc to podman run?

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