Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Need to understand shell script Post 302867939 by vbe on Friday 25th of October 2013 10:22:49 AM
Old 10-25-2013
Code:
# Load Java configuration.

[ -r /etc/java/java.conf ] \               # what is in between []  is a condition expression, -r expects 
a file after which is the case here and is true if it exists and readable by the current process
&&\      # if success execute what follows:
 . /etc/java/java.conf   
export JAVA_HOME

This User Gave Thanks to vbe For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

bash shell: 'exec', 'eval', 'source' - looking for help to understand

Hi, experts. Whould anybody clear explay me difference and usage of these 3 commands (particulary in bash) : exec eval source I've tryed to read the manual pages but did not get much. Also could not get something useful from Google search - just so much and so not exactly, that is... (3 Replies)
Discussion started by: alex_5161
3 Replies

2. UNIX for Dummies Questions & Answers

Help required to understand a variable in shell script!!!

Hi, I need to understand the following script: a=`dirname $0` b=`uname -s` if ; then c=$a/../../../platforms/$b/extlib else c=`pwd`/$a/../../../platforms/$b/extlib fi There are a bunch of variable assignments going on here!!! What does this variable means: "${a:0:1}" ... (2 Replies)
Discussion started by: abhishek2301
2 Replies

3. Shell Programming and Scripting

I need to understand the differences between the bash shell and the Bourne shell

I do not claim to be an expert, but I have done things with scripts that whole teams of folks have said can not be done. Of course they should have said we do not have the intestinal fortitude to git-r-done. I have been using UNIX actually HPUX since 1992. Unfortunately my old computer died and... (7 Replies)
Discussion started by: awk_sed_hello
7 Replies

4. Shell Programming and Scripting

Understand a old unix shell script

Hi All, I have a unix old script i but i am not able to understand the few commands in it and what it does. below is the script. if ; then for F in $(find $DIR/. ! -name . -prune -name "DP_*.dat") do IN=${F##/*/} OUT='ORD'$(echo $IN | cut -c7-) exec.ksh $IN... (2 Replies)
Discussion started by: kam786sim
2 Replies

5. Shell Programming and Scripting

Need to understand a couple of Shell Logic

Hi, I am trying what the following loop does : for i in XYZ do for j in M1 R1 R2 R3 do if then kList="" n=1 while do kList="$kList $n" let n++ done There are a couple of loop as mentioned above for R1.R2.R3. (1 Reply)
Discussion started by: johnprince1980
1 Replies

6. UNIX for Dummies Questions & Answers

Help with understand shell script coding

Good afternoon everyone, I am very new to UNIX shell scripting and I am trying to understand the following code. I know what it does but I need to modify it so it will allow me to pass a file name as *FILENAME* Thank for any guidance offered. if ] ; then match=`expr "$file" :... (2 Replies)
Discussion started by: Walter Barona
2 Replies

7. Shell Programming and Scripting

I am learning shell scripting and i would like to understand how sort -k3,3 -k 4,4 short* works

Please help me understand how sort -k3,3 -k 4,4 short* works , is it sorting 3 and 4 th field ? what is the use of specifying 3,3 and 4,4 in sort and what is actually does and i see sort -k3 short* and sort -k3,3 -k 4,4 short* giving the same output. Sort output attached Please help (2 Replies)
Discussion started by: Antony Ankrose
2 Replies

8. Shell Programming and Scripting

Need to understand how the line in perl program works as shell commend

I have a file with two line, one is header, the other actual value: TYPCD|ETID2|ETID|LEG ID|PTYP|PTYP SUB|TRD STATUS|CXL REASON|CACT|CACTNM|ENCD|ENC D NM|TRDR|ASDT|TRDT|MTDT|STDT|LS|SECID|SECID TYP|SECNM|PAR|STCC|MARKET PRICE|DIS MARKET PRICE|MARKET PRICE CURRENCY|SRC OF SETTLEMENT... (2 Replies)
Discussion started by: digioleg54
2 Replies

9. Shell Programming and Scripting

Need help to understand the below shell script

Please help me to understand the below 3 lines of code.execute shell in jenkins 1)APP_IP=$( docker inspect --format '{{ .NetworkSettings.Networks.'"$DOCKER_NETWORK_NAME"'.IPAddress }}' ${PROJECT_NAME_KEY}"-CI" ) 2)HOST_WORKSPACE=$(echo ${WORKSPACE} | sed... (1 Reply)
Discussion started by: naresh85
1 Replies

10. Shell Programming and Scripting

How to understand special character for line reading in bash shell?

I am still learning shell scripting. Recently I see a function for read configuration. But some of special character make me confused. I checked online to find answer. It was not successful. I post the code here to consult with expert or guru to get better understanding on these special characters... (3 Replies)
Discussion started by: duke0001
3 Replies
script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.10 30 Jan 2004 script(1)
All times are GMT -4. The time now is 03:00 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy