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Best Alternative for checking input parameter contains required value or not


 
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# 1  
Old 06-10-2015
Best Alternative for checking input parameter contains required value or not

Any good way to check if code has the required output

Code:
# /sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts
net.ipv4.icmp_echo_ignore_broadcasts = 1

Code:
/sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts | grep "= 1"

net.ipv4.icmp_echo_ignore_broadcasts = 1

What I can think of is above, and it display the required output.
What I want to do is that it will display 'T' if it has and value return and 'F' if no return.
# 2  
Old 06-10-2015
Heya alvinoo

Try:
Code:
/sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts | grep -q "= 1" && echo T || echo F

hth
# 3  
Old 06-10-2015
Hi I just tried and it manage to give me the output.

Code:
/sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts | grep -q "= 1" && echo T || echo F
T

Do you mind explain the && echo T || echo F means?

Another other better ways?

Last edited by Don Cragun; 06-10-2015 at 04:41 AM.. Reason: Added CODE tags, removed unreadable yellow code, reformatted question with ICODE tags instead of COLOR tags.
# 4  
Old 06-10-2015
Code:
if [ "`/sbin/sysctl -n net.ipv4.icmp_echo_ignore_broadcasts`" = "1" ]; then
 echo T
else
 echo F
fi


Last edited by MadeInGermany; 06-10-2015 at 03:45 AM.. Reason: put -n first
# 5  
Old 06-10-2015
Try also
Code:
printf "\x$((46 + 8 * $(sysctl -n net.ipv4.icmp_echo_ignore_broadcasts) ))\n"
T

# 6  
Old 06-10-2015
Code:
command1 && command2 || command3

Run command1; if its exit status is 0(=true), run command2.
If the exit status of command1 or command2 is not 0(=false), run command3.
Quick and dirty for
Code:
if command1; then command2; else command3; fi

where the exit status of command2 does not matter.
--
Quote:
Originally Posted by RudiC
Try also
Code:
printf "\x$((46 + 8 * $(sysctl -n net.ipv4.icmp_echo_ignore_broadcasts) ))\n"
T

Smilie OMG what a hack!
# 7  
Old 06-10-2015
Hi,

MadeInGermany, I have a big constraint because the output are already piped to a text file.

Code:
# /sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts >> results.txt

The results are already piped to results.txt , I would need to check if net.ipv4.icmp_echo_ignore_broadcasts = 1 is contained in the text file contains exactly.
net.ipv4.icmp_echo_ignore_broadcasts = 1 so that I can check whether it is 'T' or 'F'
 

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