if [ -e $file ]; then echo "File exists" else echo "File does not exists" fi 1. 2. 3. 4. 5. 6. 7. Similarly for example we can use while loop to check if file does not exists. This script will sleep until file does exists. Note bash negator "!" which negates the -e o...
Warning:If you create a resource-demanding task and set it to loop infinitely, it can cause system instability and unresponsiveness or slow down the machine. When developing and testing scripts with loops, it's a good practice to have safeguards in place, such as limiting the number of iterat...
# Check if the log file exists if [ -f "$log_file" ]; then # Get the size of the log file local size=$(du -b "$log_file" | cut -f1) # Check if the size exceeds the maximum size if [ "$size" -gt "$max_size" ]; then echo "Log file $log_file exceeds maximum size,...
if [ -e $file ]; then echo "File exists" else echo "File does not exists" fi Similarly for example we can use while loop to check if file does not exists. This script will sleep until file does exists. Note bash negator "!" which negates the -e option. #!/bin/bash while [ !
/bin/bash# Check if file existsif[-e"temp.txt"];thenecho"File exists"elseecho"File not found"fi Copy Output: rg@DESKTOP-3KE0KU4:~$ ./test1.sh File exists Explanation: In the exercise above, if [ -e "temp.txt" ]; then: This line checks if a file named "temp.txt" exists in...
if [ $count -eq 5 ]; then break fi ((count++)) done Run the file with bash command. $ bash while_example.sh You can check the following link to know more about the use of bash while loop. Go to top Using For Loop: The basic for loop declaration is shown in the following examp...
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 find: 搜索文件比如:根据文件名搜索find . -name filename -print tee: 将数据输出到标准输出设备(屏幕) 和文件比如:somecommand | tee outfile ...
# Iterate the loop for 10 times while[$n-le10] do # Check the value of n if[$n==6] then echo"terminated" break fi # Print the current value of n echo"Position:$n" # Increment the value of n by 1 ((n++)) done Output: ...
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 find: 搜索文件比如:根据文件名搜索find . -name filename -print tee: 将数据输出到标准输出设备(屏幕) 和文件比如:somecommand | tee outfile ...
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 ...