Suppose we want to count connections. We might use wc, grep, sed,
awk, or dd.
It turns out that only cat reads 100% of the records in the file.
wc, grep, and sed each read exactly about every other line.
awk reads 75%.
dd reads 80%.
Is this generally known? Is it generally so?
The system I'm working with is a WRT54GL router running Tomato v1.23,
Busybox v1.12.3, Linux 2.4.20 mips
Here's a transcript:
wc -l /proc/net/ip_conntrack 73 /proc/net/
ip_conntrack
wc -l < /proc/net/ip_conntrack 73
cat /proc/net/ip_conntrack | wc -l 138
grep -c '' /proc/net/ip_conntrack 73
grep -c '' < /proc/net/ip_conntrack 73
cat /proc/net/ip_conntrack | grep -c '' 138
sed n '$=' /proc/net/ip_conntrack 73
sed -n'$=' < /proc/net/ip_conntrack 73
cat /proc/net/ip_conntrack | sed -n '$=' 137
awk 'END{print NR}' /proc/net/ip_conntrack 97
awk 'END{print NR}' < /proc/net/ip_conntrack 97
cat /proc/net/ip_conntrack | awk 'END{print NR}' 136
wc -l /proc/net/ip_conntrack 72 /proc/net/
ip_conntrack
Peter
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