Examine a new file. If the filename is missing, the "current" file (see the :n and :p commands below) from the list of files in the command line is re-examined. A percent sign (%) in the filename is replaced by
test -f /etc/fstab ## true if a regular file test -h /etc/rc.local ## true if a symbolic link [ -x "$HOME/bin/hw" ] ## true if you can execute the file [[ -s $HOME/bin/hw ]] ## true if the file exists and is not empty 整数测试 整数之间的比较使用-eq、-ne、-gt...
# Function to remove a file if it exists remove_file_if_exists() { if [ -f "$1" ]; then rm -f "$1" fi } # Set base paths base_path=$(pwd | sed 's/\/spec\/dummy//')/tmp/avo packages_path="${base_path}/packages" ...
执行bash命令 $ bash bash mkdir: cannot create directory '/var/tmp': File exists mount: can't find /tmp in /etc/fstab mount: can't find /var/tmp in /etc/fstab bash: line 13: ufw: command not found iptables v1.4.21: can't initialize iptables table `filter': Permission denied (you...
-a file If file exists. -b file If file exists and is a block special file. -c file If file exists and is a character special file. -d file If file exists and is a directory. -e file If file exists. -f file If file exists and is a regular file. -g file If file exists an...
cat file.txt: 输出文件内容到标准输出设备(屏幕)上 file somefile: 得到文件类型 read var: 提示用户输入,并将输入赋值给变量 sort file.txt: 对file.txt文件中的行进行排序 uniq: 删除文本文件中出现的行列比如: sort file.txt | uniq expr: 进行数学运算Example: add 2 and 3expr 2 "+" 3 ...
Are you sure it exists?" file_name="" fi done local key key="$(basename "$file_name")" local result=0 if copy_file_to_bucket "$bucket_name" "$file_name" "$key"; then echo "Uploaded file $file_name into bucket $bucket_name with key $key." else result=1 fi local destination...
问如何在gitbash中停止正在运行的进程ENLinux 是一种自由和开放源代码的操作系统，它的使用在全球范围内...
Size is > 0 bytes [[ -f FILE ]] # File [[ -x FILE ]] # Executable [[ FILE1 -nt FILE2 ]] # 1 is more recent than 2 [[ FILE1 -ot FILE2 ]] # 2 is more recent than 1 [[ FILE1 -ef FILE2 ]] # Same files if [[ -e "file.txt" ]]; then echo "file exists" fi...
To test if a file exists. -f To test if a given file is a regular file. -d To test if the file is a directory. -b To test if the file is a block device. -s To test if the file is not zero sizes. -L To test if the file is a symbolic link. -S To test if the file...