Special character in string variable in shell script

Question

PubkeyContent=$(cat $Pubkey)    
read -r -d '' SSH_SCRIPT <<EOM
    \$(grep ${PubkeyContent} ~/.ssh/authorized_keys")
EOM

I got the wrong result.

[Debug] SSH_SCRIPT = $(grep ssh-rsa AAAAB3NzaC1yc2EAAAzSb7WKnMsysGA8kuq5Ysp02Y75d5 sam ~/.ssh/authorized_keys")com

I want this result

 [Debug] SSH_SCRIPT = $(grep "ssh-rsa AAAAB3NzaC1yc2EAAAzSb7WKnMsysGA8kuq5Ysp02Y75d5 sam@com" ~/.ssh/authorized_keys")

Inian · Accepted Answer · 2020-09-25 06:37:06Z

1

A simple fix would be to quote the PubkeyContent variable content inside the here-doc, i.e.

read -r -d '' SSH_SCRIPT <<EOM
    \$(grep "${PubkeyContent}" ~/.ssh/authorized_keys")
EOM

or if you are using bash/ksh/zsh shell it supports a way to automatically slurp in the file content using input re-direction < file and thereby avoiding the useless use of cat. You can apply that inside command substitution as

read -r -d '' SSH_SCRIPT <<EOM
    \$(grep "$(<"$Pubkey")" ~/.ssh/authorized_keys")
EOM

answered Sep 25, 2020 at 6:37

Inian

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3 Comments

Inian Over a year ago

What do you mean? What are you getting instead?

Samuel Over a year ago

I think i kew why it is not working .... because the public key is created by windows...

Inian Over a year ago

@Samuel: You can fix the DOS endings from the key and try the logic above again

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