WebAug 26, 2024 · 关于这几种while循环的写法，还有一点要注意：写法一和写法四传递数据的源都是一个单独的进程，它们传递的数据一被while循环读取，所有数据就丢弃了，而以实体文件作为重定向传递的数据，while读取了之后并不会丢弃。. 更标准一些的说法是，当标准输入 ... http://cn.voidcc.com/question/p-ayhncsyc-kd.html
cat file while read line的问题 - konglingbin - 博客园
Web语法格式一： while [条件] do 操作 done 语法格式二： while read line do 操作 done < file 通过read命令每次读取一行文件，文件内容有多少行，while循环多少次. 注意：只有表达式 … WebApr 15, 2024 · while read line 和 for 循环在 shell 中都是一种循环结构，都可以用来循环执行某些操作，但它们之间也有一些区别。. 首先，while read line 是一种更为灵活的循环结 … storck strasbourg
使用shell脚本中的read命令逐行读取输入文件会跳过最后一行 - 问 …
WebDec 24, 2012 · while read line ; do print "line=$ {line}" ; done < Test.txt. But to solve your problem, now turn on the shell debugging/trace options, either by changing the top line of the script (the shebang line) like. #!/bin/ksh -vx. Or by using a matched pair to track the status on just these lines, i.e. WebDec 27, 2016 · The while loop is the best way to read a file line by line in Linux.. If you need to read a file line by line and perform some action with each line – then you should use a while read line construction in Bash, as this is the most proper way to do the necessary.. In this article i will show the general syntax of the while read line construction in Bash and … WebAug 8, 2011 · In a vast majority of cases, you should avoid this. If all you want to do is echo the input back to output, cat does that already. Very often the processing could take place in an Awk script and the shell while read loop just complicates matters. Obviously, there are situations where you do need to process a line at a time from a file in a shell loop, but if … rose gold foil nail polish