我有这样的文件:
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我想将每个域的出现次数计算为
Domain Name No of Email
-----------------------
com 1
in 3
uk 1
最佳答案
这是一个纯 POSIX awk解决方案(从sort程序内部调用awk):
awk -F. -v OFS='\t' '
# Build an associative array that maps each unique top-level domain
# (taken from the last `.`-separated field, `$NF`) to how often it
# occurs in the input.
{ a[$NF]++ }
END {
# Print the header.
print "Domain Name", "No of Email"
print "----------------------------"
# Output the associative array and sort it (by top-level domain).
for (k in a) print k, a[k] | "sort"
}
' file
如果您有GNU awk 4.0或更高，无需外部即可凑合sort甚至可以轻松地从 gawk 内部控制排序字段程序:
gawk -F. -v OFS='\t' '
# Build an associative array that maps each unique top-level domain
# (taken from the last `.`-separated field, `$NF`) to how often it
# occurs in the input.
{ a[$NF]++ }
END {
# Print the header.
print "Domain Name", "No of Email"
print "----------------------------"
# Output the associative array and sort it (by top-level domain).
# First, control output sorting by setting the order in which
# the associative array will be looped over by, via the special
# PROCINFO["sorted_in"] variable; e.g.:
# - Sort by top-level domain, ascending: "@ind_str_asc"
# - Sort by occurrence count, descending: "@val_num_desc"
PROCINFO["sorted_in"]="@ind_str_asc"
for (k in a) print k, a[k]
}
' file
关于awk - 如何使用 awk 命令使用关联数组来计算文件中特定字符的出现次数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22800531/