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How to update an entry of another file in a Shell script?

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# 1  
Old 07-21-2012
Question How to update an entry of another file in a Shell script?
Hi all,

Say I have a shell script called update_password.sh - in this script I want to perform a task to update a specified entry of another file (e.g. users.passpords)

update_password.sh
Code:
#!/bin/bash -e

PW_FILE_DIR="${A_DIR}/.../..."
PW_FILE="users.passwords"

I want to update the password of the user whose name is Michael!

users.passwords
Code:
James: ?????
David: ?????
Michael: ?????                       //only this entry to be updated
Frank: ?????
Thomas: ?????

May I know how to achieve or could anyone please pass me a tutorial....Thanks!
# 2  
Old 07-21-2012
Like this?
Code:
name="Michael"
pass="newpassword"
sed '/^\('"$name"': \).*/s//\1'"$pass"'/' users.passwords > temp
mv temp users.passwords

This User Gave Thanks to elixir_sinari For This Post:
isaacniu
# 3  
Old 07-22-2012
Quote:
Originally Posted by elixir_sinari
Like this?
Code:
name="Michael"
pass="newpassword"
sed '/^\('"$name"': \).*/s//\1'"$pass"'/' users.passwords > temp
mv temp users.passwords

Hi,

Thanks for your reply - that works fine.. Just one more question, if the entry in my file is like below,

Code:
export David=???
export Michael=password
export Frank=???

and I would wish to transform it to be like
Code:
export David=???
export Michael=new_password
export Frank=???

then how should I modify that sentence? Sorry I'm new to sed

Thanks!
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