在这个语法中：[[ -e "/path/to/file" ]] 检查指定路径下的文件是否存在。如果文件存在，则执行 i...
we have initialized a file variable “F” holding a path to a file “new.txt” as “/home/linux/new.txt”. The “if-then” statement of bash has been utilized here to check if the file “new.txt” exists or not. The “if” clause is started with the keyword “test” followed...
Example 4: Check the Existence of the File with the Path Create a Bash file with the following script that checks whether the file path exists or not using the -f operator with the “test” command in the “if” condition. #!/bin/bash ...
In case you want to check if more than one file exists, you can still do so. Similar to the above situations, use “-f” and test if a file you’re trying to locate is still there. Separate the files by using the “&&” operator. For example, you want to test if 1 file 1 an...
Catkin tools installed successfully."fi}create_catkin_ws(){# Checkifworkspace existsif[ -e"$CATKIN_DIR/.catkin_workspace"] || [ -d"$CATKIN_DIR/.catkin_tools"]; thenecho"Catkin workspace detected at ~/catkin_ws"elseecho"Creating catkin workspace ...
[root@localhost ~]# echo ${mypath#*/} etc/sysconfig/network-scripts ${var##*word}:自左而右,查找var变量中存储的字符串中最后一次出现的由word所指明的字符,删除此字符及其左侧的所有内容; [root@localhost ~]#mypath="/etc/sysconfig/network-scripts" ...
[ -a /tmp/abc ] && echo "exists"-d file# 判断文件存在,且该文件是一个目录-e file# 判断文件存在,和 -a 等价-f file# 判断文件存在,且该文件是一个普通文件(非目录等)-r file# 判断文件存在,且可读-s file# 判断文件存在,且尺寸大于0-w file# 判断文件存在,且可写-x file# 判断文件存在,...
path if os.path.isdir('my_test_folder'): print("The directory exists") else: print("The directory does not exist") The directory exists Note that you can create a directory as follows: import os if not os.path.isdir('my_folder'): os.makedirs('my_folder') Finally, To chec...
问使用输入和标准错误长列目录的BASH脚本ENls命令是Linux中最常用的命令之一，其作用就是列出文件名和...
shopt-s checkwinsize # If set, the pattern"**"usedina pathname expansion context will # match all files and zero ormoredirectories and subdirectories. #shopt-s globstar #makelessmorefriendlyfornon-text input files, see lesspipe(1) [-x /usr/bin/lesspipe ] && eval"$(SHELL=/bin/sh lesspi...