In that case, the name of file(s) to check for is not known. Note that thetestcommand and thebash's-fflag do not work with wildcard patterns. The easiest way to check if any file with a wildcard expression exists is to uselscommand. You simply check ifls(with a pattern) returns ...
-e file: True if the file exists. -s file: True if the file exists with a size of more than zero. -r file: True if the file exists and the read permission is set. -w file: True if the file exists and the write permission is set. -x file: True if the file exists and the ...
This script first checks if the source file "error.log" exists using the -f option with the "if" statement. If the source file exists, it uses the "cp" command to copy "error.log" to a new file named "old_error.log". Afterward, it checks the exit status of the "cp" command ...
Suppose, the file extension, the total number of characters of a file, and some characters of the file are known, 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 whic...
sbopkg, slackpkg, slapt-{get,src}: Use shorter form of the check if file exists. (3388314) rmmod: Add option completions. (47c49db) testsuite/generate: Generate less linefeeds. (068e422) insmod: Install for insmod.static too. (d02b4e1) mplayer: Add -monitoraspect arg completion. (a90...
* in a shell command line will be expanded as file names(hidden files excluded), if it is a wildcard in an argument, should be enclosed by qutoes or escaped# find . -name *.c => means find . -name x.c y.c z.c where x.c y.c z.c are only files ending with .c in curren...
Wildcard: There are two characters that wildcards cannot match: a lead- ing period, and the directory slash (/). Every command, regardless of its origin, works with wildcards and other shell features: When using character sets, if you want to include a literal dash in the set, put it...
$* is the wildcard that includes all arguments with word splitting, $@ holds the same data but in an array.Q35. Which command is being run in this script to check if file.txt exists?if [ -f file.txt ]; then echo "file.txt exists" fi/...
If varname exists and isn’t null, return its value; otherwise set it to word and then return its value. Positional and special parameters cannot be assigned this way. Purpose: Setting a variable to a default value if it is undefined. Example: ${count:=0} sets count to 0 if it is ...
Printing File Names Based on Extension If you are looking for a way to find files with a specific filetype, this feature of the echo command works the same way. The echo command supports listing files in a directory with a particular extension with the wildcard character (*). ...