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sr #110239: Bash script outputs parts of the script

Submitted by:  senya
Submitted on:  Thu 21 May 2020 06:45:04 PM UTC
 
Category:  None Priority:  5 - Normal
Severity:  2 - Minor Status:  Invalid
Privacy:  Public Assigned to:  None
Open/Closed:  Open Operating System:  GNU/Linux
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Thu 28 May 2020 01:40:35 PM UTC, comment #3: 

"History expansion is performed immediately after  a  complete 
line  is read,  before  the shell breaks it into words, and is
performed on each line individually without taking quoting on 
previous  lines  into  account."

That's from the bash man page, HISTORY EXPANSION section.

Chet Ramey <chet>
Project Administrator
Tue 26 May 2020 02:21:29 PM UTC, comment #2: 

Is the priority of !$ over $() defined in some documentation?

senya
Tue 26 May 2020 02:15:08 PM UTC, comment #1: 

This is expected, it is because !$ "designates the last argument of the preceding command": https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Word-Designators

Anonymous
Thu 21 May 2020 06:45:04 PM UTC, original submission:  

GNU bash version 5.0.16(1)-release

This is a test case based on a script I'm using in my project:

#!/bin/bash -i
echo "!$(tput sgr 0)"

I expect output to be just

!

But in fact I see the following as output of this script:

echo "#!/bin/bash -i(tput sgr 0)"
#!/bin/bash -i(tput sgr 0)

This is a bit strange result to get and I was wondering whether it is a bug of bash or not

When I rewrite the script like this

#!/bin/bash -i
echo -n "!"
echo "$(tput sgr 0)"

the script works as expected.

senya

 

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    Date Changed by Updated Field Previous Value => Replaced by
    2020-05-28 chet StatusNone => Invalid

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