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technote:std

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technote:std [2020/03/29 23:56] – created Scott Cunliffetechnote:std [2025/01/21 22:07] (current) – external edit 127.0.0.1
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 When a command is executed via an interactive shell, the streams are typically connected to the text terminal on which the shell is running, but can be changed with redirection or a pipeline. When a command is executed via an interactive shell, the streams are typically connected to the text terminal on which the shell is running, but can be changed with redirection or a pipeline.
 +
 +===== Stdin =====
 +
 +Standard input is a stream from which a program reads its input data. The program requests data transfers by use of the read operation. 
 +
 +Unless redirected, standard input is inherited from the parent process. In the case of an interactive shell, that is usually associated with the keyboard.
 +
 +For processes that use a file as input, that file data may be passed (or piped) in through the stdin channel.
 +
 +==== Input via Stdin  ====
 +
 +Piping an input file myVolumes.csv via stdin to TMSS10Sync.
 +
 +<code>
 +TMSS10Sync -S user:-password@serveraddress < myVolumes.csv
 +</code>
 +
 +===== Stdout =====
 +
 +Standard output is a stream to which a program writes its output data.
 +
 +Unless redirected, standard output is inherited from the parent process.
 +
 +==== Output Via Stdout ====
 +
 +Redirecting stdout from TMSS10Sync to file sync_stdout.txt.  If the file sync_stdout.txt already exists, it will be overwritten.
 +
 +<code>
 +TMSS10Sync -S user:-password@serveraddress < myVolumes.csv > sync_stdout.txt
 +</code>
 +
 +Redirecting stdout from TMSS10Sync to file sync_stdout.txt.  Using the double ''>>'' symbol instead of a single ''>'', the file sync_stdout.txt will be appended to rather than overwritten.
 +
 +<code>
 +TMSS10Sync -S user:-password@serveraddress < myVolumes.csv >> sync_stdout.txt
 +</code>
 +
 +===== Stderr =====
 +
 +Standard error is another output stream typically used by programs to output error messages or diagnostics. It is a stream independent of standard output and can be redirected separately. 
 +
 +==== Output Via Stderr ====
 +
 +Redirecting stderr from TMSS10Sync to file sync_stderr.txt.  If the file sync_stderr.txt already exists, it will be overwritten.
 +
 +<code>
 +TMSS10Sync -S user:-password@serveraddress < myVolumes.csv > sync_stdout.txt 2> sync_stderr.txt
 +</code>
 +
 +Redirecting stdout from TMSS10Sync to file sync_stderr.txt.  Using the double ''>>'' symbol instead of a single ''>'', the file sync_stderr.txt will be appended to rather than overwritten.
 +
 +<code>
 +TMSS10Sync -S user:-password@serveraddress < myVolumes.csv >> sync_stdout.txt 2>> sync_stderr.txt
 +</code>
 +
 +===== Concatenating Stdout and Stderr =====
 +
 +Depending on the purpose of the output from stdout and stderr it is possible to combine both streams to the one output file.
 +
 +<code>
 +TMSS10Sync -S user:-password@serveraddress < myVolumes.csv > 2>&1 sync_stdout_stderr.txt
 +</code>
 +
technote/std.1585526196.txt.gz · Last modified: 2025/01/21 22:07 (external edit)