sh 将文件$ 1拆分为$ 2块

Posted 2021-05-07

#!/bin/bash
F_NAME=$1
CHUNKS=$2
ALL=`wc -l $F_NAME | awk '{print $1}'`
N=`expr $ALL / $CHUNKS`
A=0

# Getting CSV head
#head -n1 $F_NAME > ${F_NAME%%.csv}_head.csv

# Splitting
#head -n`expr $A + $N` $F_NAME | tail -n$N > ${F_NAME%%.csv}_part1.csv
awk 'NR>'$A'&&NR<='`expr $A + $N` $F_NAME > ${F_NAME%%.csv}_part1.csv
A=`expr $A + $N`
awk 'NR>'$A'&&NR<='`expr $A + $N` $F_NAME > ${F_NAME%%.csv}_part2.csv
A=`expr $A + $N`
awk 'NR>'$A'&&NR<='`expr $A + $N` $F_NAME > ${F_NAME%%.csv}_part3.csv
A=`expr $A + $N`
awk 'NR>'$A'&&NR<='`expr $A + $N` $F_NAME > ${F_NAME%%.csv}_part4.csv
A=`expr $A + $N`
awk 'NR>'$A'&&NR<='`expr $A + $N` $F_NAME > ${F_NAME%%.csv}_part5.csv

echo "File has splited into "$N" chunks:"
wc -l ${F_NAME%%.csv}_part*.csv