function execCommand(){ local func="$@" { IFS=$'\n' read -r -d '' STDERR; IFS=$'\n' read -r -d '' STDOUT; } < <((printf '\0%s\0' "$($func)" 1>&2) 2>&1) } function testCommand(){ grep foo bar echo "return code $?" } execCommand testCommand echo err: $STDE...
为我的程序(./ program )提供15个依次命名为(file01.txt、file02.txt等)的输入文件，并将输出输出到...
Copy Use the printf command to create a complex output:printf "Hello, I'm %s.\n" $USER > file.txtCopy If you want to write multiple lines to a file, use the Here document (Heredoc) redirection. For example, you can pass the content to the cat command and write it to a file:...
command>file2>&1 > file将标准输出stdout转向到文件file,而2>&1将标准错误stderr转向到当前的标准输出stdout。 转向顺序非常重要。例如,下面的例子,仅仅将标准输出stdout转向到文件file。这是因为标准错误stderr被转向到stdout发生在标准错误stdout被转向到file之前。 代码语言:javascript 代码运行次数:0 运行 AI代码...
display this help and exit --version display version information and exitwith no FILE,or when FILE is-,read standard input.Report bugs to cbug-gzip@gnu.org>."case $1 in-help) printf'%s\n'"susage" l exit 1;exit;;--version) printf '%s\n'"$version"ll exit 1;exit;;es...
: redirect all output to file exec {fd}>&1# duplicate stdout exec1> mmm2>&1dfdate+%c eval"exec 1>&$fd $fd<&-" 生成测试文件 测试脚本 #!/bin/bash if [ $#-lt1];then echo"Usage:`basename $0` file"exit5fi while read-r line;do ...
In the printf statement, the "%s" was a placeholder representing a string and telling the printf to expect a string value to be passed. Here, we passed the string value of the $greetings variable. This approach also creates the output file if it does not exist already....
32. printf "$foo" 如果$foo 变量的值中包括 \ 或者 % 符号,上面命令的执行结果可能会出乎你的意料之外。 下面是正确的写法: printf %s "$foo" printf '%s\n' "$foo" 33. for i in {1..$n} Bash 的命令解释器[25]会优先展开大括号[26],所以这时大括号{}表达式里面看到的是文字上的 $n(没有展...
CAUTION Make sure to use different filenames, otherwise your file will be overwritten! Cryptocurrency Converts Cryptocurrency based on realtime exchange rates of the top 10 cryptos Originally written by: Jonas-Taha El Sesiy Heavy modifications by: Alex Epstein Currency Converts currency based on...
printf"Hello, I'm %s.\n"$USER > Linuxmi.com.txt AI代码助手复制代码 如果要将多个行写入文件,请参考Here document(Heredoc)重定向。 例如,您可以将内容传递给cat命令并将其写入文件: cat<<EOF > linuxmi.com.txt AI代码助手复制代码 当前的工作目录是: $PWD ...