CODEWITHSUNDEEP
linuxbash
Steven Thoo
Steven Thoo

Reputation: 47

How to update the data of a certain field in text file in bash?

I currently have a text file called equipment.txt and there are some records in the text file. The format of the records are StockCode|Manufacturer|Model|Description|SerialNo|Status and the records are as follows:

S10000|HP|WM112|Wireless Mouse|11-2736-27371|Available
S10001|LOGITECH|GK2712|Gaming Keyboard|55-1662-28263|Available
S10002|DELL|GK1821|Wired Mouse|15-2541-66492|Available
S10003|LENOVO|SY1020|Keyboard|77-2661-46629|Available
S10004|PHILIPS|GN1822|Wireless Mouse|36-1638-49002|Available
S10005|HP|GV2612|Mousepad|17-2839-16392|Available

The system will allow the user to loan for the equipment. How to update the status of the equipment (ie. from Available to On Loan) in equipment.txt file after the user chooses to loan for an equipment (such as S10001), like what codes should I write?

Edited: I have tried this code awk -F'|' -v id="${code^^}" 'BEGIN{ OFS="|" } $1 == code { found=1; $6="On Loan"}1' equipment.txt >> equipment.txt, the status of S10001 did change to On Loan but it append the same records again at the bottom of the text file, as shown below. How to make it not appending the same records but only change the status of that equipment only?

S10000|HP|WM112|Wireless Mouse|11-2736-27371|Available
S10001|LOGITECH|GK2712|Gaming Keyboard|55-1662-28263|Available
S10002|DELL|GK1821|Wired Mouse|15-2541-66492|Available
S10003|LENOVO|SY1020|Keyboard|77-2661-46629|Available
S10004|PHILIPS|GN1822|Wireless Mouse|36-1638-49002|Available
S10005|HP|GV2612|Mousepad|17-2839-16392|Available
S10000|HP|WM112|Wireless Mouse|11-2736-27371|Available
S10001|LOGITECH|GK2712|Gaming Keyboard|55-1662-28263|**On Loan**
S10002|DELL|GK1821|Wired Mouse|15-2541-66492|Available
S10003|LENOVO|SY1020|Keyboard|77-2661-46629|Available
S10004|PHILIPS|GN1822|Wireless Mouse|36-1638-49002|Available
S10005|HP|GV2612|Mousepad|17-2839-16392|Available

Upvotes: 0

Views: 803

Answers (1)

Alfredo Campos Enríquez
Alfredo Campos Enríquez

Reputation: 106

sed is your friend

sed -e '/^S10001/s/Available/On Loan/' equipment.txt

Will change the status for stock code S10001. Output is like this:

$ sed -e '/^S10001/s/Available/On Loan/' equipment.txt 
StockCode|Manufacturer|Model|Description|SerialNo|Status
S10000|HP|WM112|Wireless Mouse|11-2736-27371|Available
S10001|LOGITECH|GK2712|Gaming Keyboard|55-1662-28263|On Loan
S10002|DELL|GK1821|Wired Mouse|15-2541-66492|Available
S10003|LENOVO|SY1020|Keyboard|77-2661-46629|Available
S10004|PHILIPS|GN1822|Wireless Mouse|36-1638-49002|Available
S10005|HP|GV2612|Mousepad|17-2839-16392|Available
$

You could send output to a temporary file and then overwrite with it the content of original equipment.txt file.

Regards

Upvotes: 1

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