bash 输出到文件时的 GNU 并行输出进度
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GNU parallel output progress while output to file
提问by Alvin Das
I have a simple bash script to run:
我有一个简单的 bash 脚本可以运行：
cat full_path.csv | parallel --progress -j +0 'echo -n {},; pdfgrep -c [^_] {};' > path_count.csv
Parallel's progress indicator "--progress", writes into the file path_count.csv. I only want echo {}and pdfgrep {}to write to the file, while showing --progressoutput to screen.
Parallel 的进度指示器"--progress"，写入文件path_count.csv。我只想echo {}和pdfgrep {}写入文件，同时显示--progress到屏幕输出。
If I do :
如果我做 ：
cat full_path.csv | parallel --progress -j +0 'echo -n {},>>path_count.csv; pdfgrep -c [^_] {}>>path_count.csv;'
the file path_count is still garbled with progress.
文件 path_count 仍然是乱码。
Any help is appreciated. Thanks Alvin
任何帮助表示赞赏。谢谢阿尔文
采纳答案by Ole Tange
The behaviour you see is not what GNU Parallel is designed to do: --progress is normally sent to STDERR and not to STDOUT for exactly that reason:
您看到的行为不是 GNU Parallel 的设计目的：--progress 通常被发送到 STDERR 而不是 STDOUT 正是出于这个原因：
$ seq 3 | bin/parallel --progress echo {} >/tmp/out
Computers / CPU cores / Max jobs to run
1:local / 8 / 3
Computer:jobs running/jobs completed/%of started jobs/Average seconds to complete
local:0/3/100%/0.0s
$ cat /tmp/out
1
2
3
Has there been local modifications of GNU Parallel? Can you reproduce the issue on other systems?
是否对 GNU Parallel 进行了本地修改？你能在其他系统上重现这个问题吗？
PS: instead of 'echo -n' why to try: --tag
PS：而不是 'echo -n' 为什么要尝试：--tag
回答by konsolebox
Try to redirect it completely within the subshell using exec:
尝试使用 exec 在子shell中完全重定向它：
: > path_count.csv ## truncate file
cat full_path.csv | parallel --progress -j +0 'exec >>path_count.csv; echo -n {},; pdfgrep -c [^_] {};'
