From: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>
Date: Sun, 31 Aug 2025 00:04:49 +0000 (-0400)
Subject: lsclocks: add support for LSCLOCKS_COLUMNS environmental variable
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=06489c803c0c0c4c03689d91135fc1a6d89b1417;p=thirdparty%2Futil-linux.git

lsclocks: add support for LSCLOCKS_COLUMNS environmental variable

This provides an alternate way to specify output columns similar
to the --output option.

Addresses: #2816
Signed-off-by: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>
---

diff --git a/misc-utils/lsclocks.1.adoc b/misc-utils/lsclocks.1.adoc
index fd9ca96df..ebe0b1353 100644
--- a/misc-utils/lsclocks.1.adoc
+++ b/misc-utils/lsclocks.1.adoc
@@ -66,6 +66,11 @@ Can be specified multiple times.
 Also display CPU clock of specified process.
 Can be specified multiple times.
 
+== ENVIRONMENT
+
+LSCLOCKS_COLUMNS=::
+Specifies a comma-separated list of output columns to print. All columns listed in *OUTPUT COLUMNS* can be used.
+
 include::man-common/help-version.adoc[]
 
 == OUTPUT COLUMNS
diff --git a/misc-utils/lsclocks.c b/misc-utils/lsclocks.c
index aeecddec9..1d4f567bb 100644
--- a/misc-utils/lsclocks.c
+++ b/misc-utils/lsclocks.c
@@ -667,6 +667,8 @@ int main(int argc, char **argv)
 		columns[ncolumns++] = COL_ISO_TIME;
 	}
 
+	if (!outarg)
+		outarg = getenv("LSCLOCKS_COLUMNS");
 	if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns),
 					    &ncolumns, column_name_to_id) < 0)
 		return EXIT_FAILURE;