Sponsored Content
Full Discussion: Shell Expansion Question
Top Forums Shell Programming and Scripting Shell Expansion Question Post 302549335 by eawedat on Monday 22nd of August 2011 04:56:23 PM
Old 08-22-2011
Debian Shell Expansion Question

hey all,

Code:
x="a1 b1 c2 d2"

echo ${x#*1} b1 c2 d2 
echo ${x##*1} c2 d2 
echo ${x%1*} a1 b

echo ${x%%1*}
a

what does one # stand for?
what does two ## stand for?
what does % mean?
what does two signs %% mean?
what 1* means here?
what *1 means here?

I searched google but I got hard explanation and hard english.
I need someone to explain each command to me in easy words!

thanks.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Linux Shell Question: how to print the shell script name ?

Suppose I have a script named "sc.sh" in the script how to print out its name "sc.sh"? (3 Replies)
Discussion started by: meili100
3 Replies

2. Shell Programming and Scripting

~ expansion in printf

Hi, I have a script that at one point prints to a file as follows: printf -- $2 > ~/.mydir/$1 The idea is to print to a hidden directory .mydir in my home directory. I've already sanitized the inputs and $1 is in the format path1/path2/filename and $2 is some user input. When I run this... (2 Replies)
Discussion started by: Rledley
2 Replies

3. UNIX for Dummies Questions & Answers

sudo and expansion

Hi there, Can anyone explain me the following behavior? hfserver:~# ls -l /home/cronlogs/mysqldump* -rw-r--r-- 1 root root 10658464 2009-01-18 03:00 /home/cronlogs/mysqldump_20090118030002 -rw-r--r-- 1 root root 10651035 2009-01-19 03:00 /home/cronlogs/mysqldump_20090119030001 -rw-r--r-- 1... (4 Replies)
Discussion started by: chebarbudo
4 Replies

4. Shell Programming and Scripting

Need to print the expansion of the found string (the expansion is beween two delimiters '-' , '||'

Hi , could anyone help me out with this problem. sample.txt has this content : u001- this is used for project1 || u002- this is used for p2|| not to be printed u003- this is used for project3 || u004- this is used for p4 || u005- this is used for project5 || u006- this is used for p6... (9 Replies)
Discussion started by: Balaji PK
9 Replies

5. UNIX for Dummies Questions & Answers

Expansion within cp

I have a bunch of files which I need to transfer to another location... and some of these I need to skip. For e.g. let us say the files are: cust_abc.dat cust_xyz.dat cust_def.dat and I only want to move the first two. I want to do something like: cp cust_.dat <target> ... (1 Reply)
Discussion started by: jawsnnn
1 Replies

6. Shell Programming and Scripting

Expansion does not work

Hi, I'm trying to figure out whether some files exist. Locations of those file are stored in a plain text file called temp.txt in this way: All environment variables ($LIB_HOME and $ORACLE_HOME) have been set using export command. Then I do: while read line; do ] && echo "OK ==> $line" ||... (6 Replies)
Discussion started by: AlbertGM
6 Replies

7. Shell Programming and Scripting

Bash shell expansion help

This is what I have in my directory. $ ls test1.txt test2.txt test3.txt test4.txt test5.txt test_script.sh This is what my shellscript looks like. #!/bin/bash for filename in /shell_expansion/*.txt; do for ((i=0; i<=3; i++)); do echo "$filename" ... (5 Replies)
Discussion started by: cokedude
5 Replies

8. Shell Programming and Scripting

Shell variable expansion in awk

I want to split one file input.tab into two separate ones, odd lines to input_reads1.txt, even lines to input_reads2.txt for a serial of files with similar name pattern. Also I want to "match" input/output file names to keep consistency of file name: CSEL_02.0_input.tab CSEL_03.4_input.tab... (2 Replies)
Discussion started by: yifangt
2 Replies

9. Shell Programming and Scripting

Bash expansion

Hello. I cannot write a command without using eval. Any help is welcome Note 1 : What does the function SOMETHING has no importance. Note 2 : What does the command find has no importance. It is an expansion variable problem : where to put or or or anythings else What works (FILTRE_1... (8 Replies)
Discussion started by: jcdole
8 Replies

10. Shell Programming and Scripting

Use parameter expansion over a parameter expansion in bash.

Hello All, Could you please do help me here as I would like to perform parameter expansion in shell over a parameter expansion. Let's say I have following variable. path="/var/talend/nat/cdc" Now to get only nat I could do following. path1="${path%/*}" path1="${path1##*/}" Here... (8 Replies)
Discussion started by: RavinderSingh13
8 Replies
MSSQL_FIELD_SEEK(3)													       MSSQL_FIELD_SEEK(3)

mssql_field_seek - Seeks to the specified field offset

SYNOPSIS
bool mssql_field_seek (resource $result, int $field_offset) DESCRIPTION
Seeks to the specified field offset. If the next call to mssql_fetch_field(3) won't include a field offset, this field would be returned. PARAMETERS
o $result - The result resource that is being evaluated. This result comes from a call to mssql_query(3). o $field_offset - The field offset, starts at 0. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Using mssql_field_seek(3) on the example for mssql_fetch_field(3) <?php // Connect to MSSQL and select the database mssql_connect('MANGOSQLEXPRESS', 'sa', 'phpfi'); mssql_select_db('php'); // Send a select query to MSSQL $query = mssql_query('SELECT * FROM [php].[dbo].[persons]'); // Construct table echo '<h3>Table structure for 'persons'</h3>'; echo '<table border="1">'; // Table header echo '<thead>'; echo '<tr>'; echo '<td>Field name</td>'; echo '<td>Data type</td>'; echo '<td>Max length</td>'; echo '</tr>'; echo '</thead>'; // Dump all fields echo '<tbody>'; for ($i = 0; $i < mssql_num_fields($query); ++$i) { // Fetch the field information, notice the // field_offset parameter is not set. See // the mssql_field_seek call below $field = mssql_fetch_field($query); // Print the row echo '<tr>'; echo '<td>' . $field->name . '</td>'; echo '<td>' . strtoupper($field->type) . '</td>'; echo '<td>' . $field->max_length . '</td>'; echo '</tr>'; // Move the internal seek pointer to the next // row in the result set mssql_field_seek($query, $i + 1); } echo '</tbody>'; echo '</table>'; // Free the query result mssql_free_result($query); ?> SEE ALSO
mssql_fetch_field(3). PHP Documentation Group MSSQL_FIELD_SEEK(3)
All times are GMT -4. The time now is 04:04 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy