In the following Bash command, what is the meaning of: !#:* !#:1
echo "This is a sentence." !#:* !#:1- >text3
Bash Linux – Meaning of !#:* !#:1- in Bash Command
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In the following Bash command, what is the meaning of: !#:* !#:1
echo "This is a sentence." !#:* !#:1- >text3
Best Answer
It's using bash's history substitution mechanism.
Specifically,
!#refers to the current line (up to but not including the location of the!#itself).!#:*is the part of that line after the command name (so, in this case,"This is a sentence.").!#:1-is the same as!#:*except that it omits the last word (so it doesn't include the second copy of"This is a sentence"that we just added via the!#:*).The end result is a line with three copies of
This is a sentence.echoed into a file namedtext3.