perl读写文件代码实例
#modeoperandcreatetruncate
#read <
#write > yesyes
#append >>yes
Case1:Throwanexceptionifyoucannotopenthefile:
usestrict;
usewarnings;
my$filename='data.txt';
open(my$fh,'<:encoding(UTF-8)',$filename)
ordie"Couldnotopenfile'$filename'withtheerror$!";
while(my$row=<$fh>){
chomp$row;
print"$row\n";
}
close($fh);
Case2:Giveawarningifyoucannotopenthefile,butkeeprunning:
usestrict;
usewarnings;
my$filename='data.txt';
if(open(my$fh,'<:encoding(UTF-8)',$filename)){
while(my$row=<$fh>){
chomp$row;
print"$row\n";
}
close($fh);
}else{
warn"Couldnotopenfile'$filename'$!";
}
Case3:Readonefileintoarray
usestrict;
usewarnings;
my$filename='data.txt';
open(FILEIN,"<",$filename)
ordie"Couldnotopenfile'$filename'withtheerror$!";
my@FileContents=<FILEIN>;
formy$l(@FileContents){
print"$l\n";
}
closeFILEIN;
end
热门推荐
10 喜得孙子祝福语简短唯美
11 婚礼祝福语简短朴实大众
12 员工周年祝福语大全简短
13 家长回复节日祝福语简短
14 简短生日祝福语老同学
15 夜雨祝福语简短10字
16 蛋糕祝福语简短闺蜜
17 部门过年祝福语简短独特
18 简短精炼的结婚祝福语