shell命令-read

用途

读取行信息

语法

read [-r] a b c ....

描述

读取每行的信息，并以IFS为分割符，把分割出的字符串依次传给a b c .......

-r:原始读取，不做任何处理，不将行结尾处的反斜杠解释为续行字符

举例

apuser@bj61087pcu:~/works/my_document$ cat readchar.txt
ad 45 16
jhjgsdjg
sjakhjk 1564
asjkhl 156 1654 1687

apuser@bj61087pcu:~/works/my_document$ cat read0.sh
#!/bin/sh

if [ -f read0.txt ]
then
rm read0.txt
fi

touch read0.txt

while read pa pb pc
do
    echo $pa >> read0.txt
done < ./readchar.txt

apuser@bj61087pcu:~/works/my_document$ cat read0.txt
ad
jhjgsdjg
sjakhjk
asjkhl
apuser@bj61087pcu:~/works/my_document$ vim read0.sh
apuser@bj61087pcu:~/works/my_document$
apuser@bj61087pcu:~/works/my_document$
apuser@bj61087pcu:~/works/my_document$ cat read0.sh
#!/bin/sh

if [ -f read0.txt ]
then
rm read0.txt
fi

touch read0.txt

while read pa pb pc
do
    echo $pb >> read0.txt
done < ./readchar.txt
apuser@bj61087pcu:~/works/my_document$ ./read0.sh
apuser@bj61087pcu:~/works/my_document$ cat read0.txt
45

1564
156

apuser@bj61087pcu:~/works/my_document$