Sponsored Content
Full Discussion: [SHELL] Output formatting
Top Forums Shell Programming and Scripting [SHELL] Output formatting Post 302238420 by cfajohnson on Friday 19th of September 2008 11:10:04 PM
Old 09-20-2008
Quote:
Originally Posted by DeCoTwc
Sorry to thread jack, could you explain that a little more please?


Say I have a file with 5 ip address's:
172.16.31.248
172.16.31.249
172.16.31.250
172.16.31.251
172.16.31.252
and I wanted to ping each one of them, I'd typically do something like:

Code:
#!/usr/bin/bash
for i in `cat ips.out`;do ping $i;done

What is it that is wrong with this method?
I mean I wouldn't normally put it in a script...but you know what I mean.

In this case, it doesn't matter all that much, but it's an inefficient method. It uses cat (an external command, and therefore slow) unnecessarily, and causes extra work for the shell in splitting the output of cat into separate arguments.

However, if any of the lines contained spaces, it would also split the line and $i would be assigned each word separately.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

formatting output

Hi need some advice.. #grep -i hostname test.csv (gives the below output) HOSTNAME,name,host_test,,,,,,,, Now I need to format the above output as below. HOSTNAME: name=host_test Any easy way of doing this using awk or sed or printf? (4 Replies)
Discussion started by: balaji_prk
4 Replies

2. Shell Programming and Scripting

Output Formatting

Hi Guys I need help removing some lines from output i am receiving from a shell script. Here is the output: http://i52.tinypic.com/10z0fut.png I am trying to remove the output that i have circled. . ${EDW}/extracts/bin/extracts_setup2.sh . ${EDW}/extracts/extracts.conf ... (7 Replies)
Discussion started by: mooey1232003
7 Replies

3. Shell Programming and Scripting

Formatting the query output using shell script

Hi All, I'm finding it difficult to format the query output that was returned in a shell script. Actually i have one shell script which does some DB stuff and depending on the result it will do some more tasks. My question here is to format the query output returned by mysql. Intitally my... (5 Replies)
Discussion started by: RSC1985
5 Replies

4. Shell Programming and Scripting

sql select command output formatting in shell script

Hi, I need to connect to the database and retrieve two variables from the database and store them in a variable,out of these two variables I need to get lastdigit appended to the variable 1 retrieved and variable 2 with out any modification in short select var,data from usage; o/p=... (1 Reply)
Discussion started by: rkrish
1 Replies

5. Shell Programming and Scripting

Problem in formatting output of SQL query in excel sheet in shell script

Hi Guys.. Need your help to format the output of my shell script. I am using spool command to take out put in csv file. below is my code. (for example) col USERNAME for a15 col EMAIL for a30 col FULL_NAME for a20 col LAST_LOGIN for a40 col DATE_CREATED for a40 SPOOL 120.csv... (3 Replies)
Discussion started by: Agupte
3 Replies

6. Shell Programming and Scripting

Formatting the output

Hi, I have a file which contents entries in this form. Only in /data4/temp abc.000001 Only in /data4/temp abc.000003 Only in /data4/temp abc.000012 Only in /data4/temp abc.000120 Only in /data4/temp abc.000133 Only in /data4/temp abc.001444 i want to read line by line and format... (2 Replies)
Discussion started by: arijitsaha
2 Replies

7. Shell Programming and Scripting

Formatting Shell script output to Excel

I am facing a problem formatting the output of my shell script in excel. We are directing the output of the script to an excel sheet and need long integer type data printed in Excel as it is (i.e. not in the default scientific notation). Also, leading zeroes(if any) in the output are getting... (4 Replies)
Discussion started by: bornali.p
4 Replies

8. AIX

Help Formatting Output

I am using FORTRAN 90 on AIX 5.3 and need to output my data to a tab-delimited file. It must have actual tabs, and I cannot figure out a way to make it work. The resulting file will be imported into another application (quickbooks) as an .iif file....for some reason, it needs the tabs; spaces do... (2 Replies)
Discussion started by: KathyB148
2 Replies

9. Shell Programming and Scripting

Formatting output

I have the output like below: DEV#: 9 DEVICE NAME: hdisk9 TYPE: 1750500 ALGORITHM: Load Balance SERIAL: 68173531021 ========================================================================== Path# Adapter/Path Name State Mode Select Errors 0 ... (4 Replies)
Discussion started by: Daniel Gate
4 Replies

10. Shell Programming and Scripting

SQL Query in Shell Script output formatting

Hi All, #!/bin/ksh call_sql () { sql=$1 sqlplus -s $sqlparam_sieb <<EOF SET ECHO OFF; SET NEWPAGE NONE; SET SQLBL OFF; SET VERIFY OFF; SET LINESIZE 2000; SET... (2 Replies)
Discussion started by: Kevin Tivoli
2 Replies
SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-c command] [-e] [-f] [-q] [-t[=file]] [-V] [-h] [file] DESCRIPTION
script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a, --append Append the output to file or typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can super- vise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet. -t, --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Output version information and exit. -h, --help Output help and exit. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux February 2011 util-linux
All times are GMT -4. The time now is 04:40 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy