if 命令; then 命令; [ elif 命令; then 命令; ]... [ else 命令; ] fi 注意:是否会执行then或else后面的命令,取决于if后面的命令的执行状态返回值或者elif后面的命令的执行状态返回值; 1.首先判断if后面的命令的状态返回值是否为真,如果为真,就执行then后面的语句;如果为假,就继续判断第一个elif后面的...
path=$(echo $1|sed -n "s#\(\w\)/#\1#gp") if [ -z $path ];then path=$1 fi text_file_num=$(file $path/*|grep "text"|wc -l) file_list=$(file $path/*|grep "text"|awk -F'[ :]' '{print $1}') for i in $file_list;do temp=$(wc -l $i|cut -d' ' -f1) ...
需要来自List1的List2元素的公因子 、 in list2 for j in list1 if i%j==0] print(final) 答案: 4,8,16,4,8,16,4,6,8,12,16 有两个列表,list1有因子,list2有数字,想从list1中找到所有数字,它们将list2中的所有数字相除我想要的答案:4,8,16 因为所有这些数字都可以将数字与list2相除 ...
#将ls的结果保存到变量CUR_DIR中CUR_DIR=`ls`# 显示ls的结果 echo $CUR_DIRforvalin$CUR_DIRdo# 若val是文件,则输出该文件名if[-f $val];then echo"FILE: $val"fi done 2.4 循环 For循环基本格式:for variable in list do commands done While语句基本语句格式为:while test-condition do commands done...
此处因为用到的不是很多,所以要想查看更多的关于if的命令可以看这篇文章:https://blog.csdn.net/xushiyu1996818/article/details/84545103 需要注意的是,条件表达式左右两侧都要右空格。 shell中创建序列(list) list元素之间用空格来分割,存储时也要注意每存储完一个元素要添加空格来分割元素,可以使用for..in..取值...
Create the DIRECTORY(ies), if they do not already exist. Mandatory arguments to long options are mandatory for short options too. -m, --mode=MODE set file mode (as in chmod), not a=rwx - umask -p, --parents no error if existing, make parent directories as needed -v, --verbose ...
Suppose you want to list everything in the current directory but capture the output in a file named listing.txt. The following command does just that:Bash Copy ls > listing.txt If listing.txt already exists, it gets overwritten. If you use the >> operator instead, the output from ls ...
if grep peanuts food-list.txt then echo "allergy allert!"利用 grep 搜索关键词，然后根据结果打印警告信息。6. 使用函数 在 Bash 中定义和使用函数非常简单（特别是无参函数）。例如：my_function () { echo "This is a function";} my_function # calls the function 代码中定义了一个 my_function ...
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updated brew_filter_not_in_setup.sh Oct 14, 2020 brew_filter_not_installed.sh brew_filter_not_installed.sh added brew_filter_not_installed.sh Aug 24, 2020 brew_install_packages.sh brew_install_packages.sh updated brew_install_packages.sh Feb 7, 2020 brew_install_packages_if_absent.sh brew...