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Shell Programming and Scripting

Echoing command results

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# 15  
Old 10-25-2012
I'm not sure that statement is correct, I wrote a small script:-

Code:
cat hist.sh

#!/bin/ksh

FN=$(echo "`history | tail -2 | head -1 |  grep -v history`"); echo $FN

Ran it and got the result:-

Code:
./hist.sh
1092 cat hist.sh

# 16  
Old 10-25-2012
Quote:
Originally Posted by msabhi
The reason you aren't getting any o/p from history command(though used properly) is, "history" is disabled when used inside the shell scripts...

---------- Post updated at 04:17 PM ---------- Previous update was at 04:11 PM ----------

Code:
HISTFILE=~/.bash_history
set -o history
echo `history 2 | grep -v history | awk '{print $3}'`

Include as above...This should work...

I tried that as shown:
Code:
HISTFILE=~/.bash_history
set -o history
echo `history 2 | grep -v history | awk '{print $3}'`

and got:
Code:
> cat ios.cfg | ConfProc.sh


You have ended the program
Good bye

>

# 17  
Old 10-25-2012
I guess that limited to only bash...
History command inside bash script - Unix and Linux

Quote:
Originally Posted by bipinajith
I'm not sure that statement is correct, I wrote a small script:-

Code:
cat hist.sh

#!/bin/ksh

FN=$(echo "`history | tail -2 | head -1 |  grep -v history`"); echo $FN

Ran it and got the result:-

Code:
./hist.sh
1092 cat hist.sh

This User Gave Thanks to msabhi For This Post:
Yoda
# 18  
Old 10-25-2012
Quote:
Originally Posted by bipinajith
I'm not sure that statement is correct, I wrote a small script:-

Code:
cat hist.sh

#!/bin/ksh

FN=$(echo "`history | tail -2 | head -1 |  grep -v history`"); echo $FN

Ran it and got the result:-

Code:
./hist.sh
1092 cat hist.sh

when I run on the command line:
Code:
> history 2 | grep -v history | awk '{ print $3 }'

I get:
Code:
> history 2 | grep -v history | awk '{ print $3 }'
ios.cfg
>

---------- Post updated at 03:28 PM ---------- Previous update was at 03:26 PM ----------

I even tried adding your function to the script and got nothing from the echo
# 19  
Old 10-25-2012
Hey Marc, am sorry for delaying your results..but am also new to this..apologies for that...can i know which shell you are using?
and can you try using bash in your script and see if that helps(if not included previously)
Code:
#!/bin/bash
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