SHELL读取文件的方法
时间:2016-04-03 21:15 来源:linux.it.net.cn 作者:IT
1、shell判断文件,目录是否存在或者具有权限
#!/bin/sh
myPath="/var/log/httpd/"
myFile="/var /log/httpd/access.log"
# 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限
if [ ! -x "$myPath"]; then
mkdir "$myPath"
fi
# 这里的-d 参数判断$myPath是否存在
if [ ! -d "$myPath"]; then
mkdir "$myPath"
fi
# 这里的-f参数判断$myFile是否存在
if [ ! -f "$myFile" ]; then
touch "$myFile"
fi
# 其他参数还有-n,-n是判断一个变量是否是否有值
if [ ! -n "$myVar" ]; then
echo "$myVar is empty"
exit 0
fi
# 两个变量判断是否相等
if [ "$var1" = "$var2" ]; then
echo '$var1 eq $var2'
else
echo '$var1 not eq $var2'
fi
-f 和-e的区别
Conditional Logic on Files
-a file exists.
-b file exists and is a block special file.
-c file exists and is a character special file.
-d file exists and is a directory.
-e file exists (just the same as -a).
-f file exists and is a regular file.
-g file exists and has its setgid(2) bit set.
-G file exists and has the same group ID as this process.
-k file exists and has its sticky bit set.
-L file exists and is a symbolic link.
-n string length is not zero.
-o Named option is set on.
-O file exists and is owned by the user ID of this process.
-p file exists and is a first in, first out (FIFO) special file or
named pipe.
-r file exists and is readable by the current process.
-s file exists and has a size greater than zero.
-S file exists and is a socket.
-t file descriptor number fildes is open and associated with a
terminal device.
-u file exists and has its setuid(2) bit set.
-w file exists and is writable by the current process.
-x file exists and is executable by the current process.
-z string length is zero.
是用 -s 还是用 -f 这个区别是很大的!
2、 SHELL读取文件的方法
#使用read命令读取一行数据
while read myline
do
echo "LINE:"$myline
done < datafile.txt
#使用read命令读取一行数据
cat datafile.txt | while read myline
do
echo "LINE:"$myline
done
#读取一行数据,若多行则读取每一行数据
cat datafile.txt | while myline=$(line)
do
echo "LINE:"$myline
done
备注:此种方式已验证没有问题。
#读取一行数据
while myline=$(line)
do
echo "LINE:"$myline
done < datafile.txt
#使用read命令读取变量数据
cat datafile.txt | while read paraa parab parac
do
echo "PARAA:"$paraa
echo "PARAB:"$parab
echo "PARAC:"$parac
done
#使用read命令读取变量数据
while read paraa parab parac
do
echo "PARAA:"$paraa
echo "PARAB:"$parab
echo "PARAC:"$parac
done < datafile.txt
3、使用
通过对文件的判断与读取,可实现读取一个文件中每行数据,进而实现对每行数据进一步处理。
实例:
1) 获取某程序所有已打开的pid,将pid打印出来,或关闭此进程。
a.sh文件,批量执行日志文件打印操作
#!/bin/bash
time=$(date +%F-%H-%M)
echo "$time------start--------"
res_dir=/home/weblogic/domains/scmsDomain4500/log
to_dir=/tmp/201601
echo "开始执行命令"
cd $res_dir
pwd
tail -f ManagedServer9802.out>$to_dir/9802_$time.log &
tail -f ManagedServer9803.out>$to_dir/9803_$time.log &
tail -f ManagedServer9804.out>$to_dir/9804_$time.log &
echo "命令执行结束"
b.sh文件,批量停止tail -f 的命令
#!/bin/bash
dir="/tmp/201601/"
cd $dir
echo "打印当前tail的进程数"
ps -ef|grep tail|grep -v "grep"|awk -F " " '{print $2}'|wc -l
echo "将tail进程号保存到一个文件中"
ps -ef|grep tail|grep -v "grep"|awk -F " " '{print $2}'>$dir/data.log
echo "打印该文件"
more data.log
echo "开始执行命令"
if [ ! -f "$data.log" ]; then
cat data.log|while myline=$(line)
do
echo $myline
echo “删除该进程”
kill -9 $myline
done
fi
echo "删除该文件"
rm -f data.log
echo "命令执行结束"
(责任编辑:IT)
1、shell判断文件,目录是否存在或者具有权限 #!/bin/sh myPath="/var/log/httpd/" myFile="/var /log/httpd/access.log" # 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限 if [ ! -x "$myPath"]; then mkdir "$myPath" fi # 这里的-d 参数判断$myPath是否存在 if [ ! -d "$myPath"]; then mkdir "$myPath" fi # 这里的-f参数判断$myFile是否存在 if [ ! -f "$myFile" ]; then touch "$myFile" fi # 其他参数还有-n,-n是判断一个变量是否是否有值 if [ ! -n "$myVar" ]; then echo "$myVar is empty" exit 0 fi # 两个变量判断是否相等 if [ "$var1" = "$var2" ]; then echo '$var1 eq $var2' else echo '$var1 not eq $var2' fi
-f 和-e的区别
Conditional Logic on Files
-a file exists.
-b file exists and is a block special file.
-c file exists and is a character special file.
-d file exists and is a directory.
-e file exists (just the same as -a).
-f file exists and is a regular file.
-g file exists and has its setgid(2) bit set.
-G file exists and has the same group ID as this process.
-k file exists and has its sticky bit set.
-L file exists and is a symbolic link.
-n string length is not zero.
-o Named option is set on.
-O file exists and is owned by the user ID of this process.
-p file exists and is a first in, first out (FIFO) special file or
named pipe.
-r file exists and is readable by the current process.
-s file exists and has a size greater than zero.
-S file exists and is a socket.
-t file descriptor number fildes is open and associated with a
terminal device.
-u file exists and has its setuid(2) bit set.
-w file exists and is writable by the current process.
-x file exists and is executable by the current process.
-z string length is zero.
是用 -s 还是用 -f 这个区别是很大的!
2、 SHELL读取文件的方法#使用read命令读取一行数据 while read myline do echo "LINE:"$myline done < datafile.txt #使用read命令读取一行数据 cat datafile.txt | while read myline do echo "LINE:"$myline done #读取一行数据,若多行则读取每一行数据 cat datafile.txt | while myline=$(line) do echo "LINE:"$myline done 备注:此种方式已验证没有问题。 #读取一行数据 while myline=$(line) do echo "LINE:"$myline done < datafile.txt #使用read命令读取变量数据 cat datafile.txt | while read paraa parab parac do echo "PARAA:"$paraa echo "PARAB:"$parab echo "PARAC:"$parac done #使用read命令读取变量数据 while read paraa parab parac do echo "PARAA:"$paraa echo "PARAB:"$parab echo "PARAC:"$parac done < datafile.txt
3、使用通过对文件的判断与读取,可实现读取一个文件中每行数据,进而实现对每行数据进一步处理。 实例: 1) 获取某程序所有已打开的pid,将pid打印出来,或关闭此进程。 a.sh文件,批量执行日志文件打印操作 #!/bin/bash time=$(date +%F-%H-%M) echo "$time------start--------" res_dir=/home/weblogic/domains/scmsDomain4500/log to_dir=/tmp/201601 echo "开始执行命令" cd $res_dir pwd tail -f ManagedServer9802.out>$to_dir/9802_$time.log & tail -f ManagedServer9803.out>$to_dir/9803_$time.log & tail -f ManagedServer9804.out>$to_dir/9804_$time.log & echo "命令执行结束"
b.sh文件,批量停止tail -f 的命令 #!/bin/bash dir="/tmp/201601/" cd $dir echo "打印当前tail的进程数" ps -ef|grep tail|grep -v "grep"|awk -F " " '{print $2}'|wc -l echo "将tail进程号保存到一个文件中" ps -ef|grep tail|grep -v "grep"|awk -F " " '{print $2}'>$dir/data.log echo "打印该文件" more data.log echo "开始执行命令" if [ ! -f "$data.log" ]; then cat data.log|while myline=$(line) do echo $myline echo “删除该进程” kill -9 $myline done fi echo "删除该文件" rm -f data.log echo "命令执行结束" (责任编辑:IT) |