CODEWITHSUNDEEP
bashcommand-linehistoryrxvt
potong
potong

Reputation: 58488

How do I enable history to record a here-document and its input?

When I use the command line I can recall history by using C-P or up arrow. However this does not work when trying to recall input to a here-document.

# cat <<!
> a
> b
> c
> !
a
b
c
# cat <<! # C-p to get here, expected to see ! as last input. C-c to break out
# history 2
2053  cat <<!
2054  history 2

I'm using rxvt.

P.S. This feature works correctly when using shell within emacs

Upvotes: 2

Views: 565

Answers (2)

Jonathan Hartley
Jonathan Hartley

Reputation: 16044

I have the same problem. Bash 3.2.49(1)-release

psql <<EOF
SELECT * FROM blah;
EOF

My history only preserves the first line. I have got cmdhist (and lithist) set, and they work fine for other multi-line commands, but not for heredocs. Tragic.

A workaround is:

echo "
SELECT *
FROM blah
" | psql

Upvotes: 2

user1077830
user1077830

Reputation: 31

shopt -s cmdhist

cat <<!
a
b
c
!

history | tail ...
8580  cat <<!
a
b
c
!

The cmdhist shell option, if enabled, causes the shell to attempt to save each line of a multi-line command in the same history entry, adding semicolons where necessary to preserve syntactic correctness.

The lithist shell option causes the shell to save the command with embedded newlines instead of semicolons.

From man bash

Upvotes: 2

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