The easiest way to check if any file with a wildcard expression exists is to uselscommand. You simply check ifls(with a pattern) returns non-zero. PATTERN="/etc/systemd/*.conf" if ls $PATTERN 1> /dev/null 2>&1; then echo "Files exist" fi Another method is to use thecompgencomma...
then you can use this wildcard to search the file. The first command will search those files which have the extension‘.txt’. The second command will search those files which are four characters long, the last character is ‘t’ and the extension of the file...
test_arp: Skip if ARP tables are empty (90ede98) test: generalize check whether we're being run in a container (1e3d3b4) test_feh, test_makepkg: invoke grep as "command grep" (5e706a4) test_getconf: skip if -a doesn't output any POSIX_V* (70afc1e) test_iconv: skip option ...
Replace "source_directory" and "destination_dir" with the appropriate paths to your source and destination directories. This script first creates the destination directory if it doesn't exist using mkdir -p. Then, it uses "cp" to copy all files with the ".txt" extension from the source ...
Checking if a variable exists ([[ -v varname ]]): Yes, this is possibly a killer argument, but consider the programming style of always setting variables, so you don't need to check if they exist.Are empty string comparisons any special?Of...
Note:If your input directory name contains space then the above command won’t show the result. In this case, use the following command: bash wildcard2.sh "/home/oishi/All script" How to Loop Through Hidden Files in a Directory?
这种特殊字符的扩展,称为模式扩展(globbing)。其中有些用到通配符,又称为通配符扩展(wildcard expansion)。Bash 一共提供八种扩展。 波浪线扩展 ? 字符扩展 * 字符扩展 方括号扩展 大括号扩展 变量扩展 子命令扩展 算术扩展 本章介绍这八种扩展。 Bash 是先进行扩展,再执行命令。因此,扩展的结果是由 Bash 负责...
Since every normal directory contains a.and.., you don’t need to see those.You can usels -Ato list all the files in a directory except those two. For other commands where you list files with a wildcard (i.e., pattern), youcan construct your wildcard in such a way that.and..don...
#!/bin/bash if [[ ! -e /tmp/test.py.pid ]]; then # Check if the file already exists python test.py & #+and if so do not run another process. echo $! > /tmp/test.py.pid else echo -n "ERROR: The process is already running with pid " cat /tmp/test.py.pid echo fi ...
if [ -f $file ]; then echo "$file is a regular file." elif [ -L $file ]; then echo "$file is a soft link." elif [ -d $file ]; then echo "$file is a directory." else echo "$file does not exist" fi I improved the script a little by adding a check on number of arg...