Basic help improving for in loop

Login or Register for Dates, Times and to Reply

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Basic help improving for in loop
# 1  
Basic help improving for in loop

I'm obviously very new to this. I'm trying to write a simple for loop that will read the directory names in /Users and then copy a file into the same subdir in each user directory.

I have this, and it works but it isn't great.

for dirs in $HOMEDIRS; do

if [[ -d "$dirs" && ! -L "$dirs" ]]; then
#copy the config file from source to destination
/bin/cp "/Applications/tn3270 preferences" $dirs/Library/Preferences/;



I'd like to be able to exclude some directory names ("Shared" and "shared_space"). Also, it seems like it might be awkward to construct the copy line as I did.

I'd appreciate any advice on how to do this better. Thanks!
# 2  
In case $HOMEDIRS are really user home directories,
I guess that the files that you create in /Users/*/Library/Preferences/ have the wrong owner?
Then a better method is a start wrapper e.g. named "tn3270" in the user's path
cp "/Applications/tn3270 preferences" $HOME/Library/Preferences/
exec /path/to/real/tn3270 "$@"

that will be run by the user, and files will be owned by the user.
/path/to/real/tn3270 should not be in the user's PATH.
# 3  
$HOMEDIRS are user directories. They also match the user name for each user, which is useful.

You are right that ownership will be a problem. Unfortunately the script will be run by a patch management tool (Munki) so the current user will not be the owner of any of the home directories.

If I can set the owner of the file to the name of the home directory that should work. I can nest that in the same loop that copies the file each time.

I had thought that the source file should be bundled with the application (tn3270 x) but maybe I should bundle it with the script and put it in /tmp and then read it from /tmp each time.

This doesn't work, but something more like this maybe?
#$HOMEDIRS here needs to be just the directory name, not the absolute path
for dirs in $HOMEDIRS; do

if [[ -d "$dirs" && ! -L "$dirs" ]]; then
#copy the config file from source to destination
/bin/cp "/tmp/tn3270 preferences" $dirs/Library/Preferences/;
#set ownership on the preferences file
/bin/sbin/chown $HOMEDIRS $dirs/Library/Preferences/tn3270\ preferences;



Any advice? If I'm not being clear on what needs to happen please tell me. I can try to explain it better. Thanks!
# 4  
If the file(s) are same for all users, I think its better to keep it at some standard location and provide softlinks to all the users?
# 5  
you want to do somethink like this? i dont understand what you cant to do
for dirs in $(ls /Users | grep -v Shared | grep -v shared_space) do

if [[ -d "/Users/$dirs" && ! -L "/Users/$dirs" ]]; then
#copy the config file from source to destination
/bin/cp "/Applications/tn3270 preferences" /Users/$dirs/Library/Preferences/;
chown $dirs:$dirs /Users/$dirs/Library/Preferences/tn3270\ preferences;


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks

Last edited by vbe; 06-03-2014 at 12:05 PM..
This User Gave Thanks to bacarrdy For This Post:
# 6  
Thanks for all of the suggestions! The file could potentially be modified by each user over time, so a discreet copy for each user is the best way to do it I think.

The suggestion by bacarrdy is working great. This helps me understand how these loops work much better. Like I said, I am a total beginner with scripting. Thanks again.
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #600
Difficulty: Medium
Functions in C do not need be declared before they can be used.
True or False?

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Basic FOR loop with break

Oracle Linux : 6.4/bash shell In the below I want to break out of the loop when it enters the 5th iteration. #!/bin/bash for i in 1 2 3 4 5 6 do echo "$i" if echo "Oh Nooo... i = $i. I need to stop the iteration and jump out of the loop" then break fi done But, it only... (3 Replies)
Discussion started by: John K
3 Replies

2. UNIX for Dummies Questions & Answers

Basic loop awk/shell script question..

Hi, Sorry if this is a newbie question. I guess you can use either awk or shell script for this sequence of operations, but knowing very little about either of them I'm not sure how I should try to write this. The basic objective is to copy certain files that are scattered all over my... (10 Replies)
Discussion started by: pc2001
10 Replies

3. Shell Programming and Scripting

Trying to run a basic for loop

OS : RHEL 6.1 Shell : Bash I had a similair post on this a few weeks back. But I didn't explain my requirements clearly then. Hence starting a new thread now. I have lots of files in /tmp/stage directory as show below. I want to loop through each files to run a command on each file. I... (8 Replies)
Discussion started by: kraljic
8 Replies

4. Shell Programming and Scripting

Basic bash, echo in loop for

Hi, I am trying to make a script to manage log. I want to write the name of the .gz I moved and the date : for i in `ls $replog/*.gz` do echo " $i " `echo $i date +%d:%m:%Y` `echo $datee `>> $replog/mrnet.log mv $i /var/log/vieux-logs done I need to echo... (10 Replies)
Discussion started by: Dabless
10 Replies

5. Shell Programming and Scripting

Unix Shell basic loop massive n00b

hey guys I would really appreciate some help, i need to do a project for a job that requires minimal UNIX scripting and im REALLY stuck basically Im stuck at what i believe is something really simple but i just dont have a clue how to do it efficiently and properly and i REALLY appreciate some... (16 Replies)
Discussion started by: thurft
16 Replies

6. Shell Programming and Scripting

Basic While loop won't exit...

Hi everyone - just like to say great forum...I've learned a lot off here but I just can't figure this one out...(first post) I'm writing a script to monitor a directory and email the latest modified file....(I realize there are better ways than I'm trying here...I don't like copying and pasting... (5 Replies)
Discussion started by: trevthefatty
5 Replies

7. Shell Programming and Scripting

really basic for loop question

sorry for being dumb here, but is there a way my for loop can take an entire line of a file into consideration instead of each word in a line... ill explain if i have a file like this # cat list serial: 23124 hostname: server1 and a script that does this # cat #!/bin/sh ... (6 Replies)
Discussion started by: hcclnoodles
6 Replies

8. Shell Programming and Scripting

Basic bash 'for loop' usage

Hi! I have a simple question about using a for loop. I'm trying to open up all the zip files in the currect directory with ark, but I am getting the error "bash: syntax error near unexpected token `for $i ; do ark $i ; done ; I looked in the info pages for bash, but I can't seem to figure... (2 Replies)
Discussion started by: Orange Stripes
2 Replies

9. UNIX for Dummies Questions & Answers

A basic question of FOR loop

Hi, have a basic query. Please see the below code: list="one two three" for var in $list ; do echo $var list="nolist" Done Wht if I want to print only first/ last line in the list Eg one & three Regards er_ashu (3 Replies)
Discussion started by: er_ashu
3 Replies

Featured Tech Videos