Instead of using the ‘~’ in the file path, try using the ‘${HOME}’ variable
instead. If you must use the ‘~’, you will likely need to escape it in many
places. Another thing to note, if you use single quotes ( ‘ ) instead of double
quotes ( “ ) , most places in bash scripts won’t try to expand the variables
inside them. This is also helpful if you have a script calling SSH and want to
pass a command to the remote server which contains a remote variable reference:
[bob@localhost bob]# ssh user@host ‘echo ${HOME}; exit’
[bob@localhost bob]# /home/user
Vs:
[bob@localhost bob]# ssh user@host “echo ${HOME}; exit”
[bob@localhost bob]# /home/bob
Greg
From: CentOS <centos-boun...@centos.org> on behalf of H <age...@meddatainc.com>
Date: Wednesday, July 6, 2022 at 21:41
To: Centos Mailing List <centos@centos.org>
Subject: [CentOS] Special characters in bash strings
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links or open attachments unless you recognize the sender and know the content
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I have run into a bash variable string problem that I think I have nailed down
to the variable string containing a tilde (~). Not sure if my conclusion is
correct and could use some help.
To make a long(er) story short, an associative array variable was created:
p[work_path]="~/projects/test/"
and referenced in the following format in the shell script:
"${p[work_path]}"
To my consternation this worked fine in some places but not in others. I tried
to use the above construct when piping output, as part of a file reference when
calling psql from the command line and when referencing an xslt file with
xsltproc.
In some places it worked, in others it did not but when I substituted the
variable reference above with the path in clear text itself it then worked.
It looks like there are some nuances on variable substitution that I have yet
to learn, perhaps tied to the use of the tilde since using the variable
p[work_path]="/home/user/projects/test/" seemed to work in all places.
Pointers welcome!
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