[英]Merge files based on first column
我正在尝试合并两个 CSV 文件的列。 两个 CSV 文件的第 1 列相等。 我只想通过 awk 命令执行
file1.csv
abc.co.in, AB, ABR,
def.co.in, DE, DEFF,
ghi.co.in, AB DEE, GHI,
.....................................
file2.csv
abc.co.in, abc, Linux abc 3.0.101-default 22 16:42:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
def.co.in, def, Linux def 3.0.101-default #1 SMP Mon Aug 13 18:53:23 UTC 2018x86_64 x86_64 x86_64 GNU/Linux
ghi.co.in, ghi1, Linux ghi1 3.0.default #1 SMP Fri Feb 22 16:42:57 UTC 2019x86_64 x86_64 x86_64 GNU/Linux
Expected (final csv file)
abc.co.in, AB, ABR, abc, Linux abc 3.0.101-default 22 16:42:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
def.co.in, DE, DEFF, def, Linux def 3.0.101-default #1 SMP Mon Aug 13 18:53:23 UTC 2018x86_64 x86_64 x86_64 GNU/Linux
ghi.co.in, AB DEE, GHI, ghi1, Linux ghi1 3.0.default #1 SMP Fri Feb 22 16:42:57 UTC 2019x86_64 x86_64 x86_64 GNU/Linux
.....................................
我在下面尝试过,但没有完全帮助我
awk 'FNR==NR{a[$1]=$2 FS $3;next}{ print $0, a[$1]}' file2.csv file1.csv
你能不能试试以下。
awk '
BEGIN{
FS=OFS=","
}
FNR==NR{
sub(/^ /,"")
val=$1
$1=""
sub(/,/,"")
sub(/,$/,"")
a[val]=$0
next
}
$1 in a{
$1=$1 OFS a[$1]
print $0
}' file1 file2
说明:在此处添加对上述命令的说明。
awk ' ##Starting awk program here.
BEGIN{ ##Starting BEGIN section of code here.
FS=OFS="," ##Setting FS and OFS as comma for all lines of Input_file here.
} ##Closing BEGIN BLOCK of this code here.
FNR==NR{ ##Checking condition FNR==NR which will be TRUE when Input_file1 is being read.
sub(/^ /,"") ##Substituting initial space of line with NULL for Input_file1.
val=$1 ##Creating variable val to $1 of current line.
$1="" ##Nullifying $1 to NULL now.
sub(/,/,"") ##Substituting comma very first comma with NULL in current line.
sub(/,$/,"") ##Substituting last comma with NULL here.
a[val]=$0 ##Creating n array with name a whose index is val and value if current line.
next ##next will skip all further statements from here.
}
$1 in a{ ##Checking condition if $1 of current line is present in array a then do following.
$1=$1 OFS a[$1] ##Setting $1 value to $1 OFS a[$1] value here as per OP need.
print $0 ##Printing edited current line now.
}' file1 file2 ##Mentioning Input_file names here.
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