Bash script find certain text in a file.dev and assign it to a variable

Question

I have a file.dev that contains the following:

1 DEVICES {
    2            GLOBAL-CONFIG {
    3               framerate = "20000";
    4               subframes = "0";
    5               max_consec_timeouts = "10";
    6               max_total_timeouts = "1000";
    7               schedmode = "Standard";
    8               clustermode = "Standard";
    9           }
    10           IO-DEVICES {
    11            }
    12           COMPUTING-DEVICES {
    13                RT_WORKSTATION FDT-C-XM-0120 = {
    14                    hostname = "FDT-C-XM-0120";
    15                    ipaddress = "fdt-c-XM-0120.fdtel.exter";
    16                    DISPLAYS {
    17                        main = "FDT-C-XM-0120:0.0";
    18                    }
    19                    SCHEDPARAM {
    20                        active = "0";
    21                        framerate = "20000";
    22                        subframes = "0";
    23                        max_consec_timeouts = "10";
    24                        max_total_timeouts = "1000";
    25                    }
    26                }
    27              
    28              RT_HOST fdt-c-agx-0008 = { 
    29                    hostname = "fdt-c-agx-0008";
    30                    ipaddress = "fdt-c-agx-0008";
    31                    SCHEDPARAM {
    32                        active = "0";
    33                        framerate = "20000";
    34                        subframes = "0";
    35                        max_consec_timeouts = "10";
    36                        max_total_timeouts = "1000";
    37                    }
    38                }
    39              
    40    #             RT_HOST fdt-c-agx-0003 = { 
    41    #                    hostname = "fdt-c-agx-0003";
    42    #                   ipaddress = "fdt-c-agx-0003.fdtel.exter";
    43    #                    SCHEDPARAM {
    44    #                        active = "0";
    45    #                        framerate = "20000";
    46    #                        subframes = "0";
    47    #                        max_consec_timeouts = "10";
    48    #                        max_total_timeouts = "1000";
    49    #                    }
    50    #                }
    51            }
    52        }

this file is located in a the directory C:/TechSAT/ADS2/config/file.dev

As you can see there are three entry for the variable hostname (line 14, 29 and 41) .

What i'm tying to do is to wrtie a bash script that find only the first entry (line 14) and save its value FDT-C-XM-0120 in a variable like $hostnameValue = FDT-C-XM-0120 for test purposes.

I actually found a semi-working solution like:

var=$(grep -r 'hostname' C:/TechSAT/ADS2/config/devices.dev)

However, this prints all matches like

         hostname = "FDT-C-VM-0120";
                    hostname = "fdt-c-agx-0008";
#                    hostname = "fdt-c-agx-0003";

and in my case the var must contain the value of the first match which is FDT-C-XM-0120

Thanks in advance

@ctac_ thanks for the command. Yes i found it. However it prints the whole line and would look like hostname = "FDT-C-VM-0120" with the spaces before and i just want the value FDT-C-VM-0120 — Zang322
– Zang322, Commented May 2, 2021 at 15:28
@ctac_ i've tried the following var1=$(grep -r 'hostname' -m1 C:/TechSAT/ADS2/config/devices.dev) and as already said the output is the whole line — Zang322
– Zang322, Commented May 2, 2021 at 15:47

Jetchisel · Accepted Answer · 2021-05-02 16:07:19Z

1

Awk can do what you want.

awk -F'"' '/hostname/{print $2 ; exit}' file.txt

Output

FDT-C-XM-0120

With GNU grep and cut

grep -m1 'hostname' file.txt | cut -d'"' -f2

Both solutions is using a double quotes " as the delimiter, with awk -F'"' and with cut -d'"' the double quotes needs to escaped, either use a \ or enclose it with a single quote '. So it can be written as -F\" and -d\"

edited May 2, 2021 at 16:07

answered May 2, 2021 at 15:51

Jetchisel

8,3012 gold badges23 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Zang322 Over a year ago

Thanks alot. it works perfectly. May i ask from where did you set the delimeter regarding awk command to get the desired output ?

Jetchisel Over a year ago

@Zang322, I have added a short explanation, thanks for the comment.

Zang322 Over a year ago

Great. Thanks for the explanation. would be glad if you could vote up my question.

Zang322 Over a year ago

would be thankful if you could help me here :) stackoverflow.com/questions/67359144/…

Collectives™ on Stack Overflow

Bash script find certain text in a file.dev and assign it to a variable

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related