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Correct pipe use

How do I correct a directory incorrectly copied into itself?Trouble getting menu to workfind, xargs and mv: renaming files with double-quotes, expansion and bash precedence issueMerge and print matching and non matching values between a smaller file and a huge filelimit inotifywait output to n/secWait for stdout stream to finish and then add its contents to a fileHow to overwrite output file on every input updateadding filepath in the filesRedirection and piping for greppingPipe from a while loop to a command but execute another command if pipe command fails

I am currently doing:

cat file1 file2 | sort -k1,1 > temp_file
command [options] -i temp_file > result_file

-i specifies the command input, in this case the file; I want a way to do this without explicitly specifying a temp_file.

cat file1 file2 | sort -k1,1 | command [options] -i > result_file fails, complaining there's no file after the -i.

I also tried xargs but that led to execution on every line of content instead of on the file.

edited 2 days ago

K7AAY

909928

asked 2 days ago

codeprimate123

New contributor

How can i know if it does or not?

– codeprimate123
2 days ago

1

Does your system provide either /dev/stdin or /proc/self/fd/0? If so you might be able to use them as the filename after the -i, i.e. sort -k1,1 file1 file2 | command [options] -i /dev/stdin (no cat needed). A big limitation of piped input is that the program can not use the lseek or seek calls on it so the program must be written to process the data sequentially or else provide its own buffering.

– icarus
2 days ago

add a comment |

I am currently doing:

cat file1 file2 | sort -k1,1 > temp_file
command [options] -i temp_file > result_file

-i specifies the command input, in this case the file; I want a way to do this without explicitly specifying a temp_file.

cat file1 file2 | sort -k1,1 | command [options] -i > result_file fails, complaining there's no file after the -i.

I also tried xargs but that led to execution on every line of content instead of on the file.

edited 2 days ago

K7AAY

909928

asked 2 days ago

codeprimate123

New contributor

How can i know if it does or not?

– codeprimate123
2 days ago

1

Does your system provide either /dev/stdin or /proc/self/fd/0? If so you might be able to use them as the filename after the -i, i.e. sort -k1,1 file1 file2 | command [options] -i /dev/stdin (no cat needed). A big limitation of piped input is that the program can not use the lseek or seek calls on it so the program must be written to process the data sequentially or else provide its own buffering.

– icarus
2 days ago

add a comment |

I am currently doing:

cat file1 file2 | sort -k1,1 > temp_file
command [options] -i temp_file > result_file

-i specifies the command input, in this case the file; I want a way to do this without explicitly specifying a temp_file.

cat file1 file2 | sort -k1,1 | command [options] -i > result_file fails, complaining there's no file after the -i.

I also tried xargs but that led to execution on every line of content instead of on the file.

edited 2 days ago

K7AAY

909928

asked 2 days ago

codeprimate123

New contributor

I am currently doing:

cat file1 file2 | sort -k1,1 > temp_file
command [options] -i temp_file > result_file

-i specifies the command input, in this case the file; I want a way to do this without explicitly specifying a temp_file.

cat file1 file2 | sort -k1,1 | command [options] -i > result_file fails, complaining there's no file after the -i.

I also tried xargs but that led to execution on every line of content instead of on the file.

bash shell-script

edited 2 days ago

K7AAY

909928

asked 2 days ago

codeprimate123

New contributor

edited 2 days ago

K7AAY

909928

asked 2 days ago

codeprimate123

New contributor

edited 2 days ago

K7AAY

909928

edited 2 days ago

K7AAY

909928

edited 2 days ago

K7AAY

909928

asked 2 days ago

codeprimate123

New contributor

asked 2 days ago

codeprimate123

asked 2 days ago

codeprimate123

New contributor

codeprimate123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

How can i know if it does or not?

– codeprimate123
2 days ago

1

Does your system provide either /dev/stdin or /proc/self/fd/0? If so you might be able to use them as the filename after the -i, i.e. sort -k1,1 file1 file2 | command [options] -i /dev/stdin (no cat needed). A big limitation of piped input is that the program can not use the lseek or seek calls on it so the program must be written to process the data sequentially or else provide its own buffering.

– icarus
2 days ago

add a comment |

How can i know if it does or not?

– codeprimate123
2 days ago

1

Does your system provide either /dev/stdin or /proc/self/fd/0? If so you might be able to use them as the filename after the -i, i.e. sort -k1,1 file1 file2 | command [options] -i /dev/stdin (no cat needed). A big limitation of piped input is that the program can not use the lseek or seek calls on it so the program must be written to process the data sequentially or else provide its own buffering.

– icarus
2 days ago

How can i know if it does or not?

– codeprimate123
2 days ago

Does your system provide either /dev/stdin or /proc/self/fd/0? If so you might be able to use them as the filename after the -i, i.e. sort -k1,1 file1 file2 | command [options] -i /dev/stdin (no cat needed). A big limitation of piped input is that the program can not use the lseek or seek calls on it so the program must be written to process the data sequentially or else provide its own buffering.

– icarus
2 days ago

add a comment |

1 Answer
1

active

oldest

votes

Some applications understand - there to mean stdin (check its man page), so

sort... | cmd -i - > result.txt

Most systems have a /dev/stdin special file (same as /dev/fd/0), which when open behaves like duplicating stdin, so:

sort... | cmd -i /dev/stdin > result.txt

With some shells (ksh, zsh, bash), you can also write it:

cmd -i <(sort...) > result.txt

While that would work, that file is a pipe so is not seekable. Some cmds may require a seekable file or a regular file and would fail if the file is a pipe. Then, you would have no other option than using a temporary file.

With zsh, you can use the =(...) form of process substitution:

cmd -i =(sort ...) > result.txt

for zsh to create and populate and cleanup the temporary file automatically.

Same with fish, using psub:

cmd -i (sort... | psub -f) > result.txt

With bash, still using a /dev/fd/x file but this time on a regular temporary file, deleted straight after it's opened for a more reliable clean-up:

tmp=$(mktemp) && 
 rm -f -- "$file" &&
 sort... >&3 3>&- 4<&- &&
 cmd -i /dev/fd/4 3>&-
 3> "$tmp" 4< "$tmp"

edited 2 days ago

answered 2 days ago

Stéphane Chazelas

312k57592948

The first solution worked, using the - it processed the as it was a file. I will try and remember the others as well. Great answer, thank you!

– codeprimate123
2 days ago

add a comment |

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1 Answer
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1 Answer
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oldest

votes

Some applications understand - there to mean stdin (check its man page), so

sort... | cmd -i - > result.txt

Most systems have a /dev/stdin special file (same as /dev/fd/0), which when open behaves like duplicating stdin, so:

sort... | cmd -i /dev/stdin > result.txt

With some shells (ksh, zsh, bash), you can also write it:

cmd -i <(sort...) > result.txt

With zsh, you can use the =(...) form of process substitution:

cmd -i =(sort ...) > result.txt

for zsh to create and populate and cleanup the temporary file automatically.

Same with fish, using psub:

cmd -i (sort... | psub -f) > result.txt

With bash, still using a /dev/fd/x file but this time on a regular temporary file, deleted straight after it's opened for a more reliable clean-up:

tmp=$(mktemp) && 
 rm -f -- "$file" &&
 sort... >&3 3>&- 4<&- &&
 cmd -i /dev/fd/4 3>&-
 3> "$tmp" 4< "$tmp"

edited 2 days ago

answered 2 days ago

Stéphane Chazelas

312k57592948

The first solution worked, using the - it processed the as it was a file. I will try and remember the others as well. Great answer, thank you!

– codeprimate123
2 days ago

add a comment |

Some applications understand - there to mean stdin (check its man page), so

sort... | cmd -i - > result.txt

Most systems have a /dev/stdin special file (same as /dev/fd/0), which when open behaves like duplicating stdin, so:

sort... | cmd -i /dev/stdin > result.txt

With some shells (ksh, zsh, bash), you can also write it:

cmd -i <(sort...) > result.txt

With zsh, you can use the =(...) form of process substitution:

cmd -i =(sort ...) > result.txt

for zsh to create and populate and cleanup the temporary file automatically.

Same with fish, using psub:

cmd -i (sort... | psub -f) > result.txt

With bash, still using a /dev/fd/x file but this time on a regular temporary file, deleted straight after it's opened for a more reliable clean-up:

tmp=$(mktemp) && 
 rm -f -- "$file" &&
 sort... >&3 3>&- 4<&- &&
 cmd -i /dev/fd/4 3>&-
 3> "$tmp" 4< "$tmp"

edited 2 days ago

answered 2 days ago

Stéphane Chazelas

312k57592948

The first solution worked, using the - it processed the as it was a file. I will try and remember the others as well. Great answer, thank you!

– codeprimate123
2 days ago

add a comment |

Some applications understand - there to mean stdin (check its man page), so

sort... | cmd -i - > result.txt

Most systems have a /dev/stdin special file (same as /dev/fd/0), which when open behaves like duplicating stdin, so:

sort... | cmd -i /dev/stdin > result.txt

With some shells (ksh, zsh, bash), you can also write it:

cmd -i <(sort...) > result.txt

With zsh, you can use the =(...) form of process substitution:

cmd -i =(sort ...) > result.txt

for zsh to create and populate and cleanup the temporary file automatically.

Same with fish, using psub:

cmd -i (sort... | psub -f) > result.txt

With bash, still using a /dev/fd/x file but this time on a regular temporary file, deleted straight after it's opened for a more reliable clean-up:

tmp=$(mktemp) && 
 rm -f -- "$file" &&
 sort... >&3 3>&- 4<&- &&
 cmd -i /dev/fd/4 3>&-
 3> "$tmp" 4< "$tmp"

edited 2 days ago

answered 2 days ago

Stéphane Chazelas

312k57592948

Some applications understand - there to mean stdin (check its man page), so

sort... | cmd -i - > result.txt

Most systems have a /dev/stdin special file (same as /dev/fd/0), which when open behaves like duplicating stdin, so:

sort... | cmd -i /dev/stdin > result.txt

With some shells (ksh, zsh, bash), you can also write it:

cmd -i <(sort...) > result.txt

With zsh, you can use the =(...) form of process substitution:

cmd -i =(sort ...) > result.txt

for zsh to create and populate and cleanup the temporary file automatically.

Same with fish, using psub:

cmd -i (sort... | psub -f) > result.txt

With bash, still using a /dev/fd/x file but this time on a regular temporary file, deleted straight after it's opened for a more reliable clean-up:

tmp=$(mktemp) && 
 rm -f -- "$file" &&
 sort... >&3 3>&- 4<&- &&
 cmd -i /dev/fd/4 3>&-
 3> "$tmp" 4< "$tmp"

edited 2 days ago

answered 2 days ago

Stéphane Chazelas

312k57592948

edited 2 days ago

answered 2 days ago

Stéphane Chazelas

312k57592948

answered 2 days ago

Stéphane Chazelas

312k57592948

answered 2 days ago

Stéphane Chazelas

312k57592948

The first solution worked, using the - it processed the as it was a file. I will try and remember the others as well. Great answer, thank you!

– codeprimate123
2 days ago

add a comment |

The first solution worked, using the - it processed the as it was a file. I will try and remember the others as well. Great answer, thank you!

– codeprimate123
2 days ago

The first solution worked, using the - it processed the as it was a file. I will try and remember the others as well. Great answer, thank you!

– codeprimate123
2 days ago

add a comment |

codeprimate123 is a new contributor. Be nice, and check out our Code of Conduct.

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