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
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 option. #!/bin/bash while [ ! -e myfile ]; do ...
How to check if a directory exists? How to check if a command succeeds or failed? How to do string comparison and check if a string equals to a value? How to check if a string is in an array? How to use the Bash ternary operator? How to negate an if condition in a Bash if sta...
/* Delete the character under the cursor. Given a numeric argument, kill that many characters instead. */intrl_delete(count, key)intcount, key; {intxpoint;if(count <0)return(_rl_rubout_char (-count, key));if(rl_point == rl_end) { rl_ding ();return-1; }if(count >1|| rl_ex...
First this program will print “Start program”, then the IF statement will check if the conditional expression[[ $1 -eq 4 ]]is true. It will only be true if you provide4as the first argument to the script. If the conditional expression if true then it will execute the code in betwee...
Define a function "check_user_existence()" to check if the given user exists on the system. Inside the function: Use the "id" command to check if the user exists. If the user exists, the "id" command will return successfully (exit code 0), otherwise, it will return an error (exit...
aws_ssm_put_param.sh - reads a value from a command line argument or non-echo prompt and saves it to AWS Systems Manager Parameter Store. Useful for uploading a password without exposing it on your screen aws_secret*.sh - AWS Secrets Manager scripts: aws_secret_list.sh - returns the ...
# The shift command removes one argument from the list of # command line arguments. shift shift # $* contains now all the files: for file in $*; do if [ -f "$file" ] ; then newfile=`echo "$file" | sed "s/${OLD}/${NEW}/g"` ...
do # checks for both set DM and if tool exists on device. if [[ "$DM" = "$PKG" ]] && [[ ! -x $(command -v "${ADM[$PKG]}") ]] then # sets both download tool for install and exception check. APTIN+="$PKG " APTON+=("${ADM[$PKG]}") printf "\\nSetting do...
#Take the filename from the command-line argument filename=$1 #Check whether the argument is missing or not if["$filename"!=""];then #Check whether the file exists or not using the -f operator if[[-f"$filename"]];then echo"File exists." ...