file.exists():检查文件或目录是否存在。 file.create():创建一个新文件。 file.rename():重命名文件或目录。 file.copy():复制文件或目录。 file.remove():删除文件或目录。 系统命令执行: system():执行系统命令,并返回命令的输出结果。 system2():执行系统命令,并返回命令的退出状态码。 system.file():获...
# 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" ...
if [ -f $FILE ] ; then echo "File exists" fi 但我希望 -f 不区分大小写。也就是说,如果FILE是 /etc/somefile ,我想-f识别 /Etc/SomeFile 。 我可以用glob部分解决它: shopt -s nocaseglob TARG='/etc/somefile' MATCH=$TARG* #assume it returns only one match if [[ -f $MATCH ]] ;...
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...
z Like SPACE, but if N is specified, it becomes the new window size. ESC-SPACE Like SPACE, but scrolls a full screenful, even if it reaches end-of-file in the process. ENTER or RETURN or ^N or e or ^E or j or ^J Scroll forward N lines, default 1. The entire N lines are...
check if file exist (-f) # method 1 (-f) if [ -f "sample.txt" ] then printf "\n sample.txt already exist..\n" else printf "\n sample.txt does not exist..\n" fi # method 1 (-s) | You should use -s when you work with variables - FILE exists and has a size greater ...
$ 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 must be roo...
Suppose you want to list everything in the current directory but capture the output in a file namedlisting.txt. The following command does just that: Bash ls> listing.txt Iflisting.txtalready exists, it gets overwritten. If you use the>>operator instead, the output fromlsis appended to what...
o If successful (exit status 0), it prints a success message. Otherwise, it prints a failure message. 6. Remove empty lines: Write a Bash script that removes empty lines from a text file named "file.txt". Code: #!/bin/bash# Check if the file existsif[!-f"temp.txt"];thenecho"Er...
Test if File Exists Send Email Example Get Parse Current Date Wait Command Sleep Command Create and Execute First BASH Program: You can run bash script from the terminal or by executing any bash file. Run the following command from the terminal to execute a very simple bash statement. The ou...