CODEWITHSUNDEEP
bashshellyumrhel
Ryan
Ryan

Reputation: 688

Adding YUM Repos With Variables

I am trying to add a YUM repo from the command line like so

cat > /etc/yum.repos.d/my_stable_repo.repo << EOF
[my_stable_repo]
name=Stable Repo
baseurl='https://myurl/$releasever/stable/Packages/'
enabled=1
gpgcheck=0
EOF

However, when I do it this way and I take a look at /etc/yum.repos.d/my_stable_repo.repo, I do not see $releasever in the URL. Instead, /etc/yum.repos.d/my_stable_repo.repo looks like:

[my_stable_repo]
name=Stable Repo
baseurl='https://myurl//stable/Packages/'
enabled=1
gpgcheck=0

Notice that the releasever variable was deleted. I am assuming that this is because when I run the command to write the contents to the file from the shell, linux is evaluating the $releasever variable against the global environment, seeing that is empty, and replacing it with an empty string.

But I actually want just the string $releasever to be in /etc/yum.repos.d/my_stable_repo.repo. So the file should look like this the below instead:

[my_stable_repo]
name=Stable Repo
baseurl='https://myurl/$releasever/stable/Packages/'
enabled=1
gpgcheck=0

How can I write the file out like this with the $releasever in plain text from the shell?

TLDR: How can I write a string that looks like it has a variable in it (i.e. $releasever) to a file from the command line without actually evaluating the variable?

Upvotes: 2

Views: 2871

Answers (2)

Linuxfabrik
Linuxfabrik

Reputation: 148

To prevent Bash from interpreting the dollar sign in your cat command, simply put the first EOF in single quotes like so:

cat > /etc/yum.repos.d/my_stable_repo.repo << 'EOF'
[my_stable_repo]
name=Stable Repo
baseurl='https://myurl/$releasever/stable/Packages/'
enabled=1
gpgcheck=0
EOF

Upvotes: 2

ncowboy
ncowboy

Reputation: 1335

change $ to \$, do it like this:

cat > test_my_stable_repo.repo << EOF
[my_stable_repo]
name=Stable Repo
baseurl='https://myurl/\$releasever/stable/Packages/'
enabled=1
gpgcheck=0
EOF

Upvotes: 0

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