If Conditons for a | FILE related

 In shell scripting, various file-related conditions can be used to check the properties of files. Here are some common file-related conditions in Bash scripting:

  1. Existence Checks:

    • -e file: True if file exists.
    • -f file: True if file exists and is a regular file.
    • -d file: True if file exists and is a directory.
    • -s file: True if file exists and has a size greater than zero.

  2. Permission Checks:

    • -r file: True if file exists and is readable.
    • -w file: True if file exists and is writable.
    • -x file: True if file exists and is executable.

  3. Ownership Checks:

    • -O file: True if file exists and is owned by the current user.
    • -G file: True if file exists and is owned by the current group.

  4. Modification Time Checks:

    • -nt file: True if the current file is newer than file.
    • -ot file: True if the current file is older than file.

  5. Type Checks:

    • -h file: True if file exists and is a symbolic link.
    • -L file: Same as -h.
    • -p file: True if file exists and is a named pipe (FIFO).
    • -S file: True if file exists and is a socket.
    • -b file: True if file exists and is a block special file.
    • -c file: True if file exists and is a character special file.

These conditions can be used in various contexts, including if statements, loops, and command-line operations, to determine the attributes of files and directories. Here's an example of how you might use some of these conditions:

Comments

Post a Comment

Popular posts from this blog

AWK : Commands

Image
 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++   +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++  AWK AWK stands for "Aho, Weinberger, and Kernighan". It is named after its creators Alfred Aho, Peter Weinberger, and Brian Kernighan, who developed the language while working at Bell Labs in the 1970s. replace a word with another word awk '{gsub(/sreejith/, "Balakrishnan"); print}' filename  // This will replace all the sreejith to Balakrishnan Print a particular word if that appears in the file awk '{for(i=1;i<=NF;i++) if ($i == "word") print $0}' filename Print only once if a word was found in the file awk '{for (i=1; i<=NF; i++) if ($i == "sreejith" && !seen[$i]++) print $i}' test-file.txt   Print the last word that has "america" as its last word awk '$NF ~ /america$/' test-file.txt or awk '$NF ~ /america$/{print $0}' test-...
Read more

CURL Commands

Flag Description -A, --user-agent <string> Specifies the User-Agent string to send to the server. -b, --cookie <data> Sends cookies to the server. Can be a string or a file name. -c, --cookie-jar <file> Writes cookies to the specified file after the transfer. -d, --data <data> Sends data in a POST request. Can be used with application/x-www-form-urlencoded or application/json (with -H ). -F, --form <name=content> Submits form data. Useful for file uploads and multipart forms. -G, --get Forces curl to use the GET method instead of POST when -d is used. -H, --header <header> Adds a custom header to the request. Multiple h...
Read more

$$$$ Symbols in shell scripting

  Special Variable Description $# Number of positional parameters (arguments) passed to the script. $? Exit status of the last executed command. A value of 0 usually indicates success, and any non-zero value indicates an error. $0 The name of the script or command that is being executed. $1 , $2 , ... The first, second, and subsequent positional parameters passed to the script. $1 is the first argument, $2 is the second, and so on. $* All the positional parameters passed to the script, treated as a single word. "$@" All the positional parameters passed to the script, treated as separate words. This preserves each parameter as a distinct word, even if they contain spaces. ...
Read more