Unix Common Command Index (ECHO,FIND,XARGS)

Echo

echo [OPTIONS] [string]-print STRING plus a line break

-N Do not print end of line break

-E After the string is escaped and printed

-E does not escape string for direct printing

Find

Find [-h| l| P] [starting-point] [expression]

The default starting-point is the current directory ".".

-H/L/P:-H is not a trace symbolic link,-l is a trace symbolic link,-h is a symbol link only in command parameters

Expression list: (Can be used in front of each expression! Symbol table negation)

-name Name search content exactly matches the name of the file, name can be used with the * wildcard character

-iname NAME ditto, case insensitive

-type type qualifies the type of file to be searched, D is the directory, and F is the file

-empty only search for empty directories or files

-perm 777 search for only 777 files

-depth n search only for directories with current depth n

-user user searches only for files owner is user

-print for each qualifying file, the print file name is followed by a newline character

-print0 for each qualifying file, the print file name is followed by the

-regextype Sed-regex ". */regex" for each qualifying file, use the regular expression regex to filter the results (preceded by. */is to match prefix directory)

-exec COMMAND \; For each qualifying file, execute the command, note that a semicolon is required at the end of the command, the Add \ symbol is escaped if necessary, and the current file name is referenced using the symbol {}.

-ok COMMAND \; Same as-exec, but ask before each command executes

Xargs

Xargs [OPTIONS] [UTILITY [argument ...]

The default behavior is to read the standard input character stream and cut it with delimiters (by default, including spaces, tabs, newline characters, and EOF) and execute the [UTILITY [argument ...] command with the resulting cut.

When EOF is encountered, it stops automatically.

-0 cut for input byte stream (use with find-print0 instead of default delimiter)

-e eofstr use eofstr as the closing symbol

-I replstr does not cut with the cut, but calls utility on each line of the input, using REPLSTR to represent each row (usually Replstr is "{}"). REPLSTR is replaced five times in utility arguments, sixth and above Xargs not replaced.

When used with 01, instead of a newline character, it is split with

-L number does not cut with a cut, but is called with the data of this number row after every number row is read utility

-N number is cut and the results are grouped by each number, using each set of results as parameters, calling utility

-X finds that if the number of parameters is insufficient, terminate Xargs immediately

-T print the instructions to be executed to stderr before executing utility

-p maxprocs Parallel mode, up to Maxproc process execution

-P asks the user for each instruction to confirm that it should be executed

-R When the input does not contain nonblank characters, the command is not executed (by default, even if the input is empty) [GNU Extension]

Unix Common Command Index (ECHO,FIND,XARGS)