Check if a number is equal or greater than the other The-geoperator checks that integer1 is greater than or equal to integer2. If integer 1 is greater than or equal to integer 2 it returns 0; if not, then it returns 1. [ 100 -ge 10 ] && echo $? || echo $? The-gtoperator ...
-w <file_a>: File_a exists with write permissions. -x <file_a>: File_a exists with execute permissions. -s <file_a>: File_a exists and file size is greater than zero. -O <file_a>: File_a exists and the owner is effective user ID. ...
服务器的开发和管理离不开 Bash 脚本，掌握它需要学习大量的细节。 set命令是 Bash 脚本的重要环节，却...
-h file True if file exists and is a symbolic link. -k file True if file exists and its “sticky” bit is set. -p file True if file exists and is a named pipe (FIFO). -r file True if file exists and is readable. -s file True if file exists and has a size greater than ze...
This method uses less memory than the mapfile method and works in bash 3 but it is slower for bigger files.lines_loop() { # Usage: lines_loop "file" count=0 while IFS= read -r _; do ((count++)) done < "$1" printf '%s\n' "$count" }...
filename=$1 if [ -s $filename ] then echo "File size is more than zero." else echo "File size is zero." fi Top -d file operator ‘-d’ operator is used to check any folder exists or not. The following script shows the use of this operator. name=$1 if [ -d $name ] then...
-u file 若文件存在且设置了SUID位,则为真 -w file 若文件存在且可写,则为真 -x file 若文件存在且可执行,则为真 -o file 若文件存在且被有效用户ID所拥有,则为真 -z string 若string长度为0,则为真 -n string 若string长度不为0,则为真 ...
find . -size 10k -print Find all files greater than 10k in the current directory. egrep "(foo|bar)" file.txt Find the words foo and bar in file.txt. sed s/foo/bar/g file.txt Find the word foo and replace it with a bar in file.txt. locate file.txt Find the location of the ...
[ -n "$filename" ] then if [ $verbose -gt 0 ] then printf "Filename is %s\n" "$filename" fi else if [ $verbose -gt 0 ] then printf "No filename entered\n" >&2 fi exit 1 fi ## Check whether file exists if [ -f "$filename" ] then if [ $verbose -gt 0 ] then ...
-s FILETo check if FILE exists and its size is greater than zero (which means that it is not empty). -w FILETo check if FILE exists and the write permission is granted. x FILETo check if FILE exists and the execute permission is granted. ...