Unix/Linux : How to pipe/save output of a command to file?

Problem :

You need to capture/pipe or save the output of a command execution in Unix/Linux to a file. How to do that?

Solutions :

Use the greater than sign > to save the output to a file.

For example :

cat /var/log > /tmp/varlog.log

ls /dir > dir.txt

**NOTE : > will overwrite or create new file. >> will append to existing file.

you can also use the logsave command to capture the output. However, the logsave command is only available on Linux platform.

For example :

logsave [options] /tmp/varlog.log cat /var/log

Save of the logsave options are :

-a This option will cause the output to be appended to logfile, instead of replacing its current contents.

-s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file.

-v This option will make logsave to be more verbose in its output to the user.

By Adam Ng

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