Bash

bash Shell

For using multiple filenames in one command in Unix commandline use the following command:

for i in <equal part of all filenames>*;do <command> $i;done

$i is the variable set by the loop.

Example:

for i in sync_m4606_danube_sg_org_*;do /usr/atria/etc/mkorder -data $i -fship blrsxa16.blr.infineon.com;done

More examples:

for i  in `ct lsvob |grep systemq | cut -d" " -f4`;do /usr/atria/etc/utils/albd_list -s $i;done

All Files starting with sync_m4606_danube_sg_org_ are used to perform a mkorder -data to forward these packets to Bangalore server.

for i in `cut -f2 -d" " viewlist.del`;do rm -r /home/memhub.view/$i;done

Use viewtags of column 2 of the file viewlist.del to remove the viewstorage.

Alternative

Use xargs for simply passing over results to a simple command:

ps- elf | grep <string> |tr -s " " |cut f<row nr.> -d" "|xargs <command>

tr - text replace with -s for substitute

e.g.:

ps -elf | grep CCMS | tr -s " " | cut -f5 -d" " |xargs kill

loop number

i=0; while [ $i -lt 10 ]; do echo $i; i=`expr $i + 1`; done

interactive shell

echo $-                If shell is interactive variable will contain i.

explanation

operand		3, 3 + 6 = 9 '+' is the operator and '3' and '6' are the operands.
operator		+, 3 + 6 = 9 '+' is the operator and '3' and '6' are the operands.
primary		That which stands first in order, rank, or importance
Arithmetic		most elementary branch of mathematics,
Command control	Testing exit status of a command in order to determine whether a portion of the program should be executed.
Conditional branch	Logical point in the program when a condition determines what happens next.
Logic flow		The overall design of the program. Determines logical sequence of tasks so that the result is successful and controlled.
Loop			Part of the program that is performed zero or more times.
User input		Information provided by an external source while the program is running, can be stored and recalled when needed.

debug

set -x			# activate debugging from here
w
set +x			# stop debugging from here

variables

Character	Definition
$*	Expands to the positional parameters, starting from one. When the expansion occurs within double quotes, it expands to a single word with the  value of each parameter separated by the first character of the IFS special variable.
$@	Expands to the positional parameters, starting from one. When the expansion occurs within double quotes, each parameter expands to a separate word.
$#	Expands to the number of positional parameters in decimal.
$?	Expands to the exit status of the most recently executed foreground pipeline.
$-	A hyphen expands to the current option flags as specified upon invocation, by the set built-in command, or those set by the shell itself (such as the -i).
$$	Expands to the process ID of the shell.
$!	Expands to the process ID of the most recently executed background (asynchronous) command.
$0	Expands to the name of the shell or shell script.
$_	The underscore variable is set at shell startup and contains the absolute file name of the shell or script being executed as passed in the argument list. Subsequently, it expands to the last argument to the previous command, after expansion. It is also set to the full pathname of each command executed and placed in the environment exported to that command. When checking mail, this parameter holds the name of the mail file.

quoting

Single quotes

Single quotes () are used to preserve the literal value of each character enclosed within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash.

Double quotes

Using double quotes the literal value of all characters enclosed is preserved, except for the dollar sign, the backticks (backward single quotes, ``) and the backslash.

The dollar sign and the backticks retain their special meaning within the double quotes.

The backslash retains its meaning only when followed by dollar, backtick, double quote, backslash or newline. Within double quotes, the backslashes are removed from the input stream when followed by one of these characters. Backslashes preceding characters that don't have a special meaning are left unmodified for processing by the shell interpreter.

A double quote may be quoted within double quotes by preceding it with a backslash.