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 if 块中的代码；如果文件不存在，则执行 else 块中的代码。三.stat命令 Bash 中的 stat 命令是一个多功能实用程序，可提供有关文件和目录的详细信息。你可以使用它来检查文件是否存在并收集与文件相关的其他信息。语
echo "check if variable with name $1 exists"} assert_var "FOO"我们的期望是,应该检测变量FOO,同时也不存在BAR。为此,我需要以某种方式传递变量</em 浏览0提问于2020-07-01得票数 0 回答已采纳 1回答 如何在实践中检查bash语法错误? 、 我需要检查一组脚本在语法上是否正确。我知道有几篇文章建议使用bas...
You can now usebashto check if a file and directory exist. You can also create simple test scripts as you now understand the functions of a basic bash script file. Next, check out our post onBash Function.
In case you want to check if more than one file exists, you can still do so. Similar to the above situations, use “-f” and test if a file you’re trying to locate is still there. Separate the files by using the “&&” operator. For example, you want to test if 1 file 1 an...
Catkin tools installed successfully."fi}create_catkin_ws(){# Checkifworkspace existsif[ -e"$CATKIN_DIR/.catkin_workspace"] || [ -d"$CATKIN_DIR/.catkin_tools"]; thenecho"Catkin workspace detected at ~/catkin_ws"elseecho"Creating catkin workspace ...
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...
[root@localhost ~]# echo ${mypath#*/} etc/sysconfig/network-scripts ${var##*word}:自左而右,查找var变量中存储的字符串中最后一次出现的由word所指明的字符,删除此字符及其左侧的所有内容; [root@localhost ~]#mypath="/etc/sysconfig/network-scripts" ...
[ -a /tmp/abc ] && echo "exists"-d file# 判断文件存在,且该文件是一个目录-e file# 判断文件存在,和 -a 等价-f file# 判断文件存在,且该文件是一个普通文件(非目录等)-r file# 判断文件存在,且可读-s file# 判断文件存在,且尺寸大于0-w file# 判断文件存在,且可写-x file# 判断文件存在,...
In order to check if a directory exists in Bash, you have to use the “-d” option and specify the directory name to be checked. if [[ -d "$DIRECTORY" ]] then echo "$DIRECTORY exists on your filesystem." fi As an example, let’s say that you want to check with Bash if the...
shopt-s checkwinsize # If set, the pattern"**"usedina pathname expansion context will # match all files and zero ormoredirectories and subdirectories. #shopt-s globstar #makelessmorefriendlyfornon-text input files, see lesspipe(1) [-x /usr/bin/lesspipe ] && eval"$(SHELL=/bin/sh lesspi...