如果用户的输入项少于read命令给出的变量数目,那么额外的变量值为空。如果用户的输入项多于定义的变量,那么多余的输入项会包含到最后一个变量中。如果read命令之后没有定义变量名,那么环境变量REPLY会包含所有的输入。#!/bin/bash # read-single: read multiple values into default variable echo -n
Bash编写中read $variable 命令是什么意思？Bash编写中read $variable 命令是什么意思？read $variable 是...
在Bash和其他Linux Shell中，执行程序时，它使用三个标准I/O流。每个流由一个数字文件描述符表示： 0...
environment variable is used. --no-iri turn off IRI support --local-encoding=ENC use ENC as the local encoding for IRIs --remote-encoding=ENC use ENC as the default remote encoding --unlink remove file before clobber --keep-badhash keep files with checksum mismatch (append .badhash) --...
2. Read into an array using a file (using a loop) If you have hundreds of strings already present in the form of a file then, you can use this method. This method involves the usage of the while loop in the bash so if you want a method without using any loops, then you can ski...
-bash: TMOUT: readonly variable 解决办法:修改/etc/profile配置文件,将 export TMOUT=600 readonly TMOUT 这两行注释掉 export TMOUT=600 :是用户在指定秒数内没有活动(操作)时间 readonly TMOUT: 是防止用户在命令行执行TMOUT=0操作 重新加载配置文件就不会出现此报错了 ...
Reading a File Using the IFS Variable Another way to read a file in Bash is by using the IFS (Internal Field Separator) variable. The IFS variable is used to specify the delimiter that separates fields in a line of text. By default, the IFS variable is set to space, tab, and newline...
for element in "${arr[@]}"; do printf '%s\n' "$element" done 在具有索引的数组上循环 arr=(apples...while read -r line; do printf '%s\n' "$line" done < "file" 循环文件和目录不使用 ls. # Greedy example. for 34010 变相跳出forEach循环 众所周知,forEach循环是无法中途跳出循环的,...
while read a b c; do (something) done < filename is there an elegant way to skip a variable (read in an empty value), i.e. if I want a=1 b= c=3, what should I write in the file? Right now i'm putting 1 "" 3
One of the handiest things about environment variables is that they are a standard part of the UNIX process model, which means that once an environment variable is set, it can be read by any subsequent process we run. Let’s try this and set an environment variable called $name with ...