CODEWITHSUNDEEP
bashvalgrind
MortalMan
MortalMan

Reputation: 2612

Bash script to run last command with valgrind

I am pretty inexperienced with bash. I am trying to save the last run command as a variable, this is what I have:

#!/bin/bash

prev=$(fc -ln -1)
echo $prev

This doesn't print anything. Once I save the last command, I plan on coding this line:

valgrind --leak-check=full $prev

So what am I doing wrong?

Upvotes: 0

Views: 496

Answers (2)

dimid
dimid

Reputation: 7659

I'd use aliases rather than a script, something like:

alias val='valgrind --leak-check=full'
alias vallast='val $(history 2 | head -1 | cut -d" " -f3-)'

As explained in the link, you can add these lines to your .bashrc.

BTW, the latter can also be executed as:

val !!
val !-1 #same

Or if you want to valgrind the program you ran 2 commands ago:

val !-2

These history commands are explained here.

Upvotes: 1

dan4thewin
dan4thewin

Reputation: 1184

fc references the history of the current shell. When run inside a shell script it refers to history of that new shell. If you use an alias or shell function, then fc will operate within the current shell. You can also source a script file for the same effect.

$ cat go
#!/bin/bash

set -o history
echo a b c
fc -nl -1

$ ./go
a b c
         echo a b c

$ alias zz='fc -nl -1 | tr a-z A-Z'
$ zz
         ALIAS ZZ='FC -NL -1 | TR A-Z A-Z'

Upvotes: 1

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